I bought that thunder-muff piece of shit off ebay for 2 bills. Don't do it and learn from my mistake. Just invest in a real name-brand exhaust. One, it backfires like a mother ****er, (well not that bad, but too much for me) and 2 the resonator underneath goes bad and makes a tink noise about every 4 seconds once the car is heated up. It's annoying, it does it while your stopped in traffic and then as your walking away from it you hear tink...tink...tink...as soon as I changed my exhaust it went away. After the resonator was diagnosed as POS ofcourse. The power gain was decent, but all in all it has crappy craftsmanship. DON'T DO IT. Besides that 5 inch tip is a LITTLE too big.