At 3" there is little to no backpressure. At 4" you're just making extra noise.Originally Posted by s13sliderŪ
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.
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