I wouldnt say Diablo doest rush tunes. On the Silverado they came out with engine tunes with out transmission tunes. That is bad. Any tune you get must have a transmission and engine tune. Damage may result from not tuning both at the same time (adding power but leaving trany stock). A dyno tune or a wide band o2 street tune is best and not much more money.
2012 2SS/RSM6 Silver with Painted CarbonFlash rally stripes,3.91gears, NewEra ported TB,OTR, HeritageGrill, NightFury cam, Melling296 Oilpump, KatechCR-5 chain, Cloyes LS2HD tensioner, PAC 1205x springs and Comp Cams trunion upgrade. American Racing1 7/8"LT headers w/cats, and TWM fullShifter BMRsways,trailing arms,toe rods, delrin cradle bushings,BK039rear control arm bushingkit,front suspension bushing kit. Solo Mach XL exhaust 25% Fluidampr