Like I said, just youtube "LS4 exhaust". Check in the comments of each one for mods. Tons of different options; however note a camera usually never does a car justice. I had two setups...neither had headers. First one was drone city, second was much better. All of the things I did to the car were listed in the videos.
SLP setup: https://www.youtube.com/watch?v=1AHTsY4TpYo - Truck status - without the resonator. I would recommend putting one back in if you do any sort of catless header or loud muffler setup...because you get that LS rasp/buzz that isn't much fun.
Borla setup: https://www.youtube.com/watch?v=pbE25ajERSU - Was WORLDS better...no drone...no crap notes coming out the back.
SLP setup full bore against a turbo Cobalt: https://www.youtube.com/watch?v=OfS1qPqUJZw
