tsunami982 said:i went with a nice magnaflow. in my honest opinion you wont get much performance difference between any of the good aftermarket mufflers (FM, borla, magnaflow, etc.) because most of them are basically the same thing with small tweaks.
i picked the mag because i liked the sound. i think it has a slightly smoother rumble vs the flowmaster that has a rougher sound (IMO). it all depends on your preference. go to a shop and see if the guy is willing to "fit" different mufflers on so that you can hear how it will actually sound on YOUR truck; thats what i did.