you are not really going to feel the gain in hp but will notice the sound. yeah greddy, shunk2, apexi, ect. are all good brands but are you really willing to spend $400-$500 for a couple hp????h: apexi , magnaflow , and shunk2 sells performance mufflers and you can have a muffler shop custom the pipes for you for half the price think about it ... you live in miami just like me and i am sure you see all those fart cans driving around. custom or catback your not going to see a big difference unless you have other parts with it like intake,headers , a good tune up, ect... but brand does count if you are talking about noise cheap no name (ebay .ect)=fart can good name brand nice= deep tone untill you get on it! what other performance parts do you have ?????