I put cutouts on my 4 door camaro.
Since its the same engine as the 2 door V6 Camaros (3.6L DI), I thought some of you may like to hear that they actually sound pretty good. I was worried about a real obnoxious sound like many V6s offer.
http://youtu.be/BRqK9gImgMg
The words of the guy who did it at cincy speed said "It sounds like a pissed off M3".
Its hard to get a good sound recording, but here's what I can tell you. Its not obnoxiously loud, but its loud enough to let those around you know whats up. Its quiet enough that I'm probably going to leave them open all the time. There is no raspiness, rattle, or otherwise common with many V6s and pretty much all I4s. Any raspiness you hear is because its exceeding the limits of my cell phone microphone.
I have turn-downs I'm putting on, I just wanted to see how they looked, worked, sounded, before I put them on, so the look will get cleaned up- plus you can only see them from laying on the ground behind the car, but I'm going to put the turn downs on it anyway.
So take from it what you will, and watch the video, but I must say I am 100% pleased