I have been looking at resonated test pipes/high flow cats for a while, and i am not totally sure still what the difference is between the HR cats, and the early models cats.. can anyone explain if you can fit HR cats in a z, or what is different between the two?

 

Flanges from manifold/headers to cat are different between the two. No bolt on.

/thread <Next time search the 43 or so threads on this>

 

ah I gotcha, and yes will do, my bad