I think the only difference with a regular cab and extended is an extra length of straight pipe under the cab. Everything else should be the same.
Believe me, I did think about putting it on the trailblazer, but I would end up only using the oil pump. The rest of the kit would have to be changed, the turbo would have to be upgraded and the intake pipe would have to be custom made.
Arrival Blue '04 RCSB 5.3
3.73's, G80, 2" shackles, STS turbo at 5lbs, FMIC, 3" Borla muffler, 3000 Yank, Shift Kit, 43lb injectors, Elec.fans, Nelson tune.
13.65 100.2mph 2.1 60ft. G-Tech