muffler shops have to fix cats if they are toast... they probably can only LEGALY replace them with OEM or OEM replacement parts... they probablay wouldnt use HI FLOWS even though they are "legal"
but to be honest... it's an easy job.. might as well do them yourself...
-as
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'89 GT Convertible:
TFS TW Heads, TFS Street Intake, TFS Stage 1 Cam, FMS 1.6 RRs, 24# Injectors, Pro-M 75mm MAF, No Name CAI, 3.73s, O/R H-Pipe, FlowMasters, AOD w/ Trans-Go Shift Kit
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