I have a 04 Silverado crew cab 1500 in black, and am looking for the best ugrades (cosmetic and performance). Found this forum so I thought I would ask the members for help.
I have already installed the True flow filtersystem, re-programmed with Superchips, installed the white face gauge from a SS, New Street Scene front bumper, removed all moldings and badging, new grill, painted all door handles and mirrors, free flow convertors and Magnaflow muffler.

Future upgrades:
Shorty Headers (not sure of the Brand)
Cowl hood (reflexxtion)
electric fans (want them to be controlled by ecm)
Nelson tune
Supercharger
Trans servo upgrade (looking for the correct part numbers)

So what am I missing. I have heard of a few free upgrades for better performance, but have not found any info for them. I really don't want to do a 6.0 engine swap or anything, so I am trying to push the 5.3 as far as it will go.