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  <xsd:element id="hlly_DeferredTaxAssetsInterestExpenseLimitation" name="DeferredTaxAssetsInterestExpenseLimitation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_DeferredTaxAssetsLiabilitiesNotYetDeductible" name="DeferredTaxAssetsLiabilitiesNotYetDeductible" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_DeferredTaxAssetsReservesOnAssets" name="DeferredTaxAssetsReservesOnAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_DeferredTaxAssetsRightofuseLiability" name="DeferredTaxAssetsRightofuseLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_DeferredTaxLiabilitiesTradename" name="DeferredTaxLiabilitiesTradename" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_DefinedBenefitPlanBenefitObligationExpensesPaid" name="DefinedBenefitPlanBenefitObligationExpensesPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_DefinedBenefitPlanPlanAssetsExpensesPaid" name="DefinedBenefitPlanPlanAssetsExpensesPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
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  <xsd:element id="hlly_DefinedContributionPlanEmployerDiscretionaryContributionPercentOfMatch" name="DefinedContributionPlanEmployerDiscretionaryContributionPercentOfMatch" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:percentItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_DelayedDrawTermLoanMember" name="DelayedDrawTermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_DetroitSpeedIncMember" name="DetroitSpeedIncMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_DirectorCompensation" name="DirectorCompensation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_DocumentAndEntityInformation" name="DocumentAndEntityInformation" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_DrakeAutomotiveGroupLlcMember" name="DrakeAutomotiveGroupLlcMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_EarnOutAdjustment" name="EarnOutAdjustment" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_EarnOutLiabilityMember" name="EarnOutLiabilityMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_EarnOutSharesMember" name="EarnOutSharesMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_EarnOuts" name="EarnOuts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_EffectiveIncomeTaxRateReconciliationTransactionCosts" name="EffectiveIncomeTaxRateReconciliationTransactionCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_ElectronicSystemsMember" name="ElectronicSystemsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_EmergingGrowthCompanyPolicyTextBlock" name="EmergingGrowthCompanyPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_EmpowerSponsorHoldingsLlcMember" name="EmpowerSponsorHoldingsLlcMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_ExhaustMember" name="ExhaustMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_FairValueAdjustmentOfWarrantsDueToClassificationAsLiabilities" name="FairValueAdjustmentOfWarrantsDueToClassificationAsLiabilities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_FdicDepositsMaturities" name="FdicDepositsMaturities" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_FinspeedClassicInstrumentsAdsRocketAndSpeartechMember" name="FinspeedClassicInstrumentsAdsRocketAndSpeartechMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_FinspeedLlcMember" name="FinspeedLlcMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_FirstLienNoteDueNovember172028Member" name="FirstLienNoteDueNovember172028Member" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_GainLossOnTerminationOfLeases" name="GainLossOnTerminationOfLeases" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
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  <xsd:element id="hlly_IncreaseDecreaseInPrepaidsAndOtherCurrentAssets" name="IncreaseDecreaseInPrepaidsAndOtherCurrentAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_IncreaseInLiabilitiesForAssociatedLeaseObligations" name="IncreaseInLiabilitiesForAssociatedLeaseObligations" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_IncreaseInNoncurrentAssetsForRightofuseAssets" name="IncreaseInNoncurrentAssetsForRightofuseAssets" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="instant"/>
  <xsd:element id="hlly_IssuanceOfEarnoutShares" name="IssuanceOfEarnoutShares" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_JohnsAcquisitionMember" name="JohnsAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_JohnsSouthernKentuckyClassicsAndVestaMotorsportsMember" name="JohnsSouthernKentuckyClassicsAndVestaMotorsportsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_MeasurementInputPriceHurdleOneMember" name="MeasurementInputPriceHurdleOneMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_MeasurementInputStrikePriceMember" name="MeasurementInputStrikePriceMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_MechanicalSystemMember" name="MechanicalSystemMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_MergerAgreementMember" name="MergerAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_MonteCarloSimulationModelMember" name="MonteCarloSimulationModelMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_NetCashProceedsFromBusinessCombinationAndPIPEFinancing" name="NetCashProceedsFromBusinessCombinationAndPIPEFinancing" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_NoteToFinancialStatementDetailsTextual" name="NoteToFinancialStatementDetailsTextual" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element id="hlly_OutstandingTermOfTheEarnoutShare" name="OutstandingTermOfTheEarnoutShare" nillable="true" substitutionGroup="xbrli:item" type="xbrli:durationItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_PaymentsForRedemptionOfCommonStock" name="PaymentsForRedemptionOfCommonStock" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_PermanentTaxDifferences" name="PermanentTaxDifferences" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_PipeInvestorsMember" name="PipeInvestorsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_PrincipalPaymentMember" name="PrincipalPaymentMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_PrivatePlacementWarrantsMember" name="PrivatePlacementWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ProceedsFromBusinessCombinationAndFinancingNetOfIssuanceCostsPaid" name="ProceedsFromBusinessCombinationAndFinancingNetOfIssuanceCostsPaid" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ProceedsFromForwardPurchaseAgreement" name="ProceedsFromForwardPurchaseAgreement" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_ProfitInterestUnitsMember" name="ProfitInterestUnitsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_PublicWarrantsMember" name="PublicWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_RacequipMember" name="RacequipMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_RelatedPartyAcquisitionAndManagementFeeCosts" name="RelatedPartyAcquisitionAndManagementFeeCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ResearchDevelopmentPreProductionAndStartUpCosts" name="ResearchDevelopmentPreProductionAndStartUpCosts" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_ResellerCustomersMember" name="ResellerCustomersMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_RisksAndUncertaintiesPolicyTextBlock" name="RisksAndUncertaintiesPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_RocketAcquisitionMember" name="RocketAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_SafetyMember" name="SafetyMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ScheduleOfAcquisitionRestructuringAndManagementFeeCostsTableTextBlock" name="ScheduleOfAcquisitionRestructuringAndManagementFeeCostsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ScheduleOfElementsOfBusinessCombinationToCashFlowsTableTextBlock" name="ScheduleOfElementsOfBusinessCombinationToCashFlowsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ScheduleOfFairValueOfPensionPlanAssetsTableTextBlock" name="ScheduleOfFairValueOfPensionPlanAssetsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_ScheduleOfInformationAssociatedWithTheMeasurementOfOperatingLeaseObligationsTableTextBlock" name="ScheduleOfInformationAssociatedWithTheMeasurementOfOperatingLeaseObligationsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
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  <xsd:element id="hlly_ScheduleOfOperatingLeaseAssetsAndObligationsTableTextBlock" name="ScheduleOfOperatingLeaseAssetsAndObligationsTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_SecSchedule1209ValuationAllowancesAndReservesChargedAgainstAllowances" name="SecSchedule1209ValuationAllowancesAndReservesChargedAgainstAllowances" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_ShareholdersEquityMember" name="ShareholdersEquityMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_SimpsonPerformanceProductsIncMember" name="SimpsonPerformanceProductsIncMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_SpeartechAcquisitionMember" name="SpeartechAcquisitionMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_StockIssuedDuringPeriodSharesWarrantsExercised" name="StockIssuedDuringPeriodSharesWarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_StockIssuedDuringPeriodValueWarrantsExercised" name="StockIssuedDuringPeriodValueWarrantsExercised" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element id="hlly_StockIssuedInPeriodSharesRecapitalizationTransactionNet" name="StockIssuedInPeriodSharesRecapitalizationTransactionNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:sharesItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_StockIssuedInPeriodValueRecapitalizationTransactionNet" name="StockIssuedInPeriodValueRecapitalizationTransactionNet" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_SubscriptionAgreementMember" name="SubscriptionAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_TaxEffectsOfFairValueAdjustmentOfWarrants" name="TaxEffectsOfFairValueAdjustmentOfWarrants" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_TermLoanMember" name="TermLoanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_The2021OmnibusIncentivePlanMember" name="The2021OmnibusIncentivePlanMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_The401kMember" name="The401kMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_TheCreditAgreementMember" name="TheCreditAgreementMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_TotalAcquisitionRestructuringAndManagementFees" name="TotalAcquisitionRestructuringAndManagementFees" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="debit" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_TrancheOneMember" name="TrancheOneMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_WarrantAndForwardPurchaseAgreementLiabilitiesPolicyTextBlock" name="WarrantAndForwardPurchaseAgreementLiabilitiesPolicyTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_WarrantLiability" name="WarrantLiability" nillable="true" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType" xbrli:balance="credit" xbrli:periodType="instant"/>
  <xsd:element abstract="true" id="hlly_WarrantLiabilityPrivatePlacementWarrantsMember" name="WarrantLiabilityPrivatePlacementWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_WarrantLiabilityPublicWarrantsMember" name="WarrantLiabilityPublicWarrantsMember" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:domainItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_WarrantLiabilityTextBlock" name="WarrantLiabilityTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
  <xsd:element id="hlly_WeightedAverageAssumptionsForBenefitObligationTableTextBlock" name="WeightedAverageAssumptionsForBenefitObligationTableTextBlock" nillable="true" substitutionGroup="xbrli:item" type="dtr-types:textBlockItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-note-10-income-taxes-schedule-of-income-before-income-tax-domestic-and-foreign-jurisdictions-details" name="statement-statement-note-10-income-taxes-schedule-of-income-before-income-tax-domestic-and-foreign-jurisdictions-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_statement-statement-note-10-income-taxes-schedule-of-provision-and-effective-tax-rates-details" name="statement-statement-note-10-income-taxes-schedule-of-provision-and-effective-tax-rates-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-note-17-commitments-and-contingencies-schedule-of-accrual-for-product-warranties-details" name="statement-statement-note-17-commitments-and-contingencies-schedule-of-accrual-for-product-warranties-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-note-4-balance-sheet-details-schedule-of-property-plant-and-equipment-details" name="statement-statement-note-4-balance-sheet-details-schedule-of-property-plant-and-equipment-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-note-5-goodwill-and-other-intangible-assets-schedule-of-goodwill-details" name="statement-statement-note-5-goodwill-and-other-intangible-assets-schedule-of-goodwill-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-note-9-revenue-summary-of-revenue-based-on-geographic-location-details" name="statement-statement-note-9-revenue-summary-of-revenue-based-on-geographic-location-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
  <xsd:element abstract="true" id="hlly_statement-statement-note-9-revenue-summary-of-revenue-by-product-category-details" name="statement-statement-note-9-revenue-summary-of-revenue-by-product-category-details" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-schedule-ii-valuation-and-qualifying-accounts-tables" name="statement-statement-schedule-ii-valuation-and-qualifying-accounts-tables" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
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  <xsd:element abstract="true" id="hlly_statement-statement-significant-accounting-policies-policies" name="statement-statement-significant-accounting-policies-policies" nillable="true" substitutionGroup="xbrli:item" type="xbrli:stringItemType" xbrli:periodType="duration"/>
</xsd:schema>
