If you are on a budget for the money you're best off by getting a Flowmaster American Thunder 40 series muffler. You won't have that Po'ed hornet tone and they aint too expensive. If you want to use a Magnaflow direct bolt on exhaust system bring your wallet they aint cheap. here's how my exhaust is set up with the previous muffler mentioned above:
If Flowmaster is still a bit too mcuh for your budget Cherry Bomb Turbo mufflers are pretty good and even cheaper. They usually run around $20 bucks or so.