Inlet/Outlet of stock GSR cat
since the gsr exhaust piping is 2.0" and the header collector is 2.0" i'm going venture out there to say that they're both 2.0"
the header-side flares out to accomodate the stock donut gasket, although i don't know how wide it actually spreads...
the header-side flares out to accomodate the stock donut gasket, although i don't know how wide it actually spreads...
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