Exhaust is more than just the muffler. It's starts from header and runs through the downpipe and cat, through exhaust piping, and on through the muffler and exhaust tip. If you're looking to replace exhaust, don't cheap out an just get a muffler. It is quite possible that you wont get the best sound with just a muffler. But, of course, sound is all personal preference

Try to get at least a cat back exhaust system. Then maybe throw a header on later. If you have more questions just use the search function! Oh, and from wat I see, a great deal of people on here mostly stick to magnaflow, Remus, etc. look up the "post up your exhaust" thread or whatever it is called. Hope you find wat you want!
