Anyone know how you can do it without buying a 3" cat? I cant find a 2" to 3" cat anywhere, for the life of me. Yet I want to boost, but I already learned my lesson on stock exhaust...no power whatsoever. My GSR is just begging to run 5 PSI non intercooled till I buy an air to air. Im thinking I need to pick up a collector and a couple flanges and just make my own peice...on the 92 GSR there is an adapter peice that fits in between the cat and the downpipe if I remember correctly...

Thanks for any and all help!

Alex

 

i have a test pipe that flares from 2.5" to 3" where my cat SHOULD be(i never run a cat),i'd say flare the downpipe to 3" before the cat and put in a 3" cat--they are out there.