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12-12-2016
Hey i can't find the thread right now but I've read multiple places that the stock catback was good for I believe around 300whp which I can understand when it splits at the y everything after that should be good to go but, before the y the resonator sections is only 2.25 I believe and then if that's the case would that not be a restriction? If 2.25 isn't a restriction everyone would just keep there stock downpipe right?
Sent from my LG-H901 using Tapatalk
12-12-2016
The exhaust flow means less the further away it is from the exhaust manifolds.
It's why you can run 3in factory exhaust on a V8 that makes 350-400whp and be just fine. The muffler is the bigger restriction than the size of the pipe is.
12-12-2016
Ooo well I guess that makes sense then. Are there any gains replacing the stock res with a 2.5" or 3" magnaflow or other brand?
Sent from my LG-H901 using Tapatalk
12-18-2016
Not much gains from replacing the res other than a different exhaust note. The only restriction in the factory exhaust I have heard of was the "U" bend on the 97-03 after the cat.
Sent from my ASUS_Z00TD using Tapatalk
12-18-2016
the stock down pipe is the restriction, headers give you a 3 inch to the res. and your done. unless you got a turbo or some insane m90 build. then a full 3" cat back would be worth the money.
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