[99teg]

What size should i put a test pipe to my gsr, am currently going n/a, and will be like this for a while, i was thinking 2' or 2.25?
which should i go with?

 

[#17]

2.5"

 

[Nick]

testpipe.com is coming out with a bolt on 3" high flow cat. but if you can't wait a month then go with 2.25 like me.

 

[deMad10]

Don't go any smaller than the tubing on either end of it.