2k budget huh? well your gonna need something to tune with and getting it tuned by someone who can so heres a list:
budget set up:
ls6 intake manifold (300 or so)
ls6 heads(ive seen 400 before)
aggressive to big cam (750 ish with springs, retainers, pushrods)
nitrous kit(500 or cheaper, by used if you can)
injectors(something bigger)
tuning with program(500 or so…its a estimate)
so in reality your looking at 2450+(injectors) thats not even including install(unless you do it)
baller set up:
buy a new stroker engine (cost=enough)
also since you own a c5 and if you go through with the mods dont put drag radials or slicks on the car. The rear output shafts will be destroyed…ive heard of guys that break them during a highway pull. if your doin the rear gears then save yourself the trouble and do them at the same time…