depends what you are looking for. If you just want good sound, but not big power boost, go with REMUS, on the opposite end is B&B TriFlow, alot of power but loud, still sounds good though.
ACS I think is overpriced, but it is high quality. Dinan, not aggressive enough for the price. I went with a UUC TSE, very happy with it. good power, good sound. www.uucmotorwerks.com or check out www.bavauto.com they have some good stuff, including scorpion (good value).
I'm happy with my Dinan exhaust, not too loud, but subtle enough to make itself heard. It doesn't have a "ricey fart-can" sound to it, and looks nice from the rear with the dual O tips. Its definitely a mod I recommend, it allows the car to growl and make the noises that it should, even with the windows up; but I didn't realize its full potential until I got a CAI to compliment it. :thumbup:
I suggest you find sound clips of any exhausts you might want and then hear them in person as well. Ride in the car too if you have the opportunity. The m3 exhaust sounds mean, but sometimes when I want to leave it in a lower gear, I end up shifting to the next because when going through residential areas, or with people in the car, its kind of obnoxious.
Dont get me wrong though, theres nothing like winding the car out, hearin the exhaust roar, and givin the M all she's got.
Dont go too big on the tips either or it looks cheesy.
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