I'm sure this topic has been beaten to death, but any how here we go. I've finally gotten around to getting a cat back system for my mustang, but of course the question of which one is for me has come up. I've narrowed it down to three choices: 1. flowmaster 40 series("American Thunder") 2. Magnaflow stainless cat back or 3. Spintechs and find some pipes? do they make a cat back?. Right now my car is a daily driver, it's mechanically stock, and I want something a little bit more exciting than the meineke crap thats on it now. I'm 17, so loud is good, but not too loud. Also i don't have unlimited funds, so cheaper is always better. But anyhow throw some opinons out there, I'd love to hear what you all think is best.