TripleJay22

i have a 2 1/2 in exhaust, with a 2 1/2in h pipe would be benefit much to put new hi flow cats on?

89mustangfive0

well the cats burn the un burned ehxaust gasses whcih make your car run better ( cleaner)

steel1

If you are still using the stock 4 cath-pipe, then switching to a high flow 2 cat h or x would definitely help. If your currecnt h-pipe is off road (no cats) then the only reason to switch to catted, is for emissions control. I currently run a Pypeshigh flow catted x, to stay smog legal, and love it.

TripleJay22

yeah well i was looking and would i benefit anything from using 2 cats compared to using a catless h pipe or x pipe because i will jsut keep my pipe with cats now and can switch it out in a single day if needed for emissions so that isnt a problem and would i be better or with a h or x pipe? i have equal length headers so which will give me better horsepower? or does it really matter?

steel1

Going without cats would improve flow over high flow catted design (marginally imo). As far as h or x, I think it's more a matter of sound choice than performance. H pipes are a little deeper x pipes more raspy, I beleive the benefit to the x pipe only occurs in veryhigh rpm situations.

mmm rice

The high flow vs. no is marginal at best(if its a good cat).
I custom did my hpipe so that i can put 2 highflow cats on for inspection, but take them off on the street (only for sound, which is ALOT louder)

cgarray17

So do you think a H pipe would sound better and the performans is not that much different compared to an X pipe?

TripleJay22

no i dont know which is better,and im asking what people think would be better for performance and for sound?

mmm rice

performance.....xpipe
sound......preference
i have heard both that i love the sounds of. ALL preference