I assume you are talking about a complete cat-back system, right? Well some of my fav. stores, www.projectnissan.com and www.phase2motortrend.com have most of the really good exhausts for good prices. As you are probably tired of hearing, you get what you pay for. I have a BLitz Nur Spec R on my S14 SR, and it sounds great, very deep, smooth, but still somewhat agressive at higher RPM, but never "snarly" or tin sounding, like a crappy weld on muffler. It is expensive, but well worth the $. The most impottant thing though, is that is is tougher than hell it has survived many dirft crashed without much morethan a little ding, even after being smacked into a curb at 50mph. Partially because it is 100% stainless. Tanabe are some pretty crazy sounding canisters, and my friend's GP sports is so lound, it probably not what you want. the A'pex N1 are cheap anough, but also sound funny. you can find URAS exhausts for surprisingly cheap, and they are good pieces, but definitely NOT quiet. I think they area good kind of loud, but you may not. Most of the Greddy exhausts are made to be pleasant in tone but still quiet, so I recommend one of those. Whatever you get, you probably don't want something that is straight-through canister style, sot a bif ole muffler like you have now, because those suck ass for any forced induction and don't relieve much backpressure. Whatever you do, don't just compromise and get a universal muffler, it will look and sound like total ass.