High Flow Cat

[Cool Mr Steve]

With a Big 16g running in the neighborhood of 15-16 psi, a 3" downpipe and 2.5" catback... How much of a difference would a 3" high flow cat make?

 

[hystericfox]

There was a thread on here that I read awhile ago that told of a test between a straight pipe and a high-flow cat was something like 5whp loss.

 

[blackGSX2g]

I've got a high flow on my 3'' o2 eliminator exhaust and the only difference I noticed was the sound and the smell. The cat seemed to take the edge off the sound and actually made it smell tolerable.

 

[Cool Mr Steve]

Take the edge off the sound??? What exactly does that mean? Does it make a pretty big difference in sound?

 

[Cool Mr Steve]

My main concern, I guess, is if my downpipe is even doing any good if my exhaust has to neck down at the cat.

 

[blackGSX2g]

Take the edge off the sound??? What exactly does that mean? Does it make a pretty big difference in sound?

It made my exhaust less raspy. It gave me a softer deeper tone, not really a huge difference but enough to notice if you pay attention to it.