my exhaust is a true dual flowmaster supper 44s with 5" x 27" tips. i kept my cats and stock headers. i like it and picked up about 1-2 mpg. its deep and loud. louder than glasspacks but without the crackle and pop.
What kind of exhaust you got on your truck? I'm looking for an exhaust and I found a headers to tips kit (Gibson) but I kinda just want the cat kit.