If i have a test pipe, would the gsr b pipe fit my car? i was thinking usually the flange wouldnt match put but i have a test pipe with rotating flange....is my theory right? thanks i know gsr is shorter but couldnt i make it fit?

 

short test pipe make up for the long b pipe?

 

I have seen people use shorter test pipes/high flow cats with a GSR cat-back on their LS tegs. But if your boosted, then why are you using a GSR b-pipe? Shouldn't you go with something bigger?

 

i can get a good deal for 2.5 inch gsr piping so anyone agree? short test pipe plus long gsr exhaust equal long cat and short ls exhaust?