Ok so like the title says.
I have a 1995 gsr with itr 4-1 header i would like to use a high flow cat or test pipe but which one will i use? Am i better off just getting a test pipe made?

 

replace your cat with a test pipe,that should work

 

i recommend the password JDM adj. test pipe....or the omni power adj. testpipe...

is an investment in itself....works with any US or J-spec header with 2.5 collectors....

you can't go wrong....

just make sure you dont go through inpsection station with it on...