Got some good results from my KB Intercooled 2.1 install couple of weeks back:
440 rwhp/400tq @ 8psi boost:
Also installed MGW shifter, 42 lb injectors, MA, Dyno/Diablo tune, KB BoostAPump.
Previous mods include:
4.10 gears
Bassani X-Pipes
FR500 wheels (18")
Yokohama rubber 255/35ZR front 275/35ZR rear
Steeda suspension w/CC plates
Autometer Boost/Fuel gauges
