the non cat'd systems arent much.. just a couple of pipes... I bought mine from summit... it's a piece of junk... didnt line up right, brackets were welded wrong.. etc... so for a couple extra bucks you might wanna get a name brand setup... though when it's all said and done it's just a tube of aluminized steel... you might find a set on ebay for a good price... you know it'd fit cause they were most likley mounted... unless they are rusted they dont go bad really... probably cheaper too.. .
as for H or X? I dont know what performance aspects each posses... i have an H... I'm sure they each serve a prupose... maybe someone else can help on that one
-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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