the mufflers are mounted in the rear, and only held on by a few bolts. REAL easy swap. install is very quick, and anybody could do it, no shop needed. there is not much gain with the muffler swap, the stock mufflers flow very well. sound is the main reason to swap the mufflers. the cat-backs are a waste of $$ IMO. the factory pipes are 2.5" mandrel bent, but they do have some minor flaws that some companies feel need to be addressed. not worth it IMO. some people think they need every last HP, but unless you are running forced induction (supercharger, turbo, etc.), then you dont need it and wont be able to notice the VERY MINOR gains in power. best place to buy depends on which mufflers you want to get. i know summit racing sells the flows for under $290 shipped.