What up? I own a 03 rcsb with a 5.3. Mods are Intake, throttle body bypass, catback exhaust and a diablosport predator programmer.
Future plans for the truck are to get it in the 450-500hp and torque range. I'm planning on some shorty headers or the doug thorley's tri-y's, electric fans, intake manifold of a ls6, sts turbo kit, and cam and head work. The truck dynod at 248 hp and 256 torque. I got 89,xxx miles on it.