Don't go pypes..cheap because they suck. You'd be happy with either..borla or roush. Not sure which would be louder but ataks are pretty aggressive.
And they look like doo doo! Lol. Roush are very loud : ) , I have them and they sound awesome. That being said I do like the borla atak and they will probably be my next Axel backs in a couple of years, but its really hard to pay that much for axelbacks.............but I probably will. Lol.