Hey, I have an '08 crew cab 2wd Chevy with a 5.3. I'm not sure what exhaust to go with, I'm in between Flowmaster and Magnaflow and I'm not sure whether to do true duals, dual in/out, or single in/ dual out. Either way I am getting turndowns, I just want it to be really deep and loud. I am also considering ditching the manifold and getting a set of LT headers, how will this change my sound and performance? Which brand should I get and how much do they run? How well do the stock cats flow, and should I replace them with hi flow cats? I also want to know which bolt-ons you recommed. I plan on getting either a supercharger or turbo and building my tranny and rearend in the future but wanted to get some little things done first. I want a CAI and was looking at either AFE or Volant, a custom tune, and maybe some servos or something.