I would go get a gt take off exhaust for less than $50 and save for a cai/tune combo. Its nice to have a big name exhaust (flowmaster, bolra, ect) but a gt take off will give you the same performance gains and will still sound a lot better then stock. Then when you add the cai/tune you will really feel like you are the fastest mustang on the road, until a cobra smokes you
And Saleen, it appeared like alot of black smoke was coming out from your exhaust, you might be running a bit rich, are you running any other mods?