what I did is had a Y pipe put on behind the cat and than had dual 2 1/4 inch pipe ran all the way back and out the rear, gives it a really nice rap when you let off the gas, and it has a nice deep tone when you get on it

Overall price 190

 

heres what i did. custom Y pipe into a 3inch catco cat from summit racing. i put a casper electronics o2 simulator in for post cat. this tricks the computer into thinking you have a downstream o2 sensor. the only reason for this sensor is to tell your computer that your cat is running properly. this sensor costs like 80 bucks from www.jegs.com . it runs 3 inches all the way back with a 3 inch glass pack from www.summitracing.com . costs 20 bucks. over all it sounds damn loud. i have one pipe and is a hell of a lot louder than any flowmaster. deep rumble at idle and sounds like im in a nascar race when taching it out. even just at low speeds going through town i routinely set off car alarms. overall with headers cost about 600 bucks. did all the work myself. all my friends love it too. just do some research out there, exsepcially with jegs and summit and see what you can find. then experiment.