[theAryanTwang]

muffler itself shouldn't cost you more than $100, it's the labour and welding charges that will get ya... most shops are like $85/hr... so a straightforward muffler replacement should not cost you more than $200. But like everyone said, if they gotta do cat-back or replace anything else then you're paying for piping and more labour.

also, check what the difference in cost is between a stock replacement and a universal muffler (on my car a stock replacement would have ran $350, my universal dynomax muffler was only $100)

good luck