4" inlet import style muffler??

[s13slider®]

say it with me guys. "no back pressure".

[GT-S Boy]

say it with me guys. "no back pressure".

a little bit of backpressure is good for NA cars, i don't remember why but i learend that in my automotive class

[itsnotarex]

say it with me guys. "no back pressure".

At 3" there is little to no backpressure. At 4" you're just making extra noise.

You could just run an open DP with a little turndown....as I assume that we're talking about a boosted setup here. Plus, a 4" pipe, even with a muffler, might actually make your car louder than if you had nothing at all. Like, I have a friend who has a wrx with an Ansa exhaust, and it's actually louder than when he's running an open DP. It's like the piping adds some sort of resonance to the tone.

If you're running an NA setup, for the love of God do not run a 4" exhaust. NA motors need some backpressure to run properly. You'll probably lose power and at worst burn a valve.

I say go to midas or something and have them make you a 2.5" straight pipe with a resonator.