The heart of the XS-425 is its CoolCharger supercharger, which spins on ceramic bearings, eliminating the need for internal lubrication. The system runs so cool without oil that Dyno-Proven President Peter Bayer claims intercoolers are unnecessary in all but the hottest climates.

When supercharging a Flex-Fuel version of the Vortec 5300 engine, there's no need to swap the injectors: They can be instructed by a reprogrammed PCM (provided in the kit) to spray more fuel. The PCM corrects the air/fuel mix, changes the stock timing advance, and alters the transmissions shift points.

Dyno-Proven's suspension tweaks are equally thorough. Rather than achieving its three-inch drop with shorter rear springs, it uses custom-wound progressive springs that are the same height as the stock units. As the springs compress, they get stiffer, but during normal driving, the ride remains supple. Up front, instead of cranking down the torsion bars to lower the front end, the adjuster's hex pattern is altered to creates the same amount of tension as the stock adjuster.

Dyno-Proven's modifications will work on virtually any GM truck including the H2 with air suspension. In fact, a dealer-installed 500-horse engine and sport suspension kit for the Cadillac Escalade EXT and ESV are currently the company's best-sellers. All kits are 50-state legal.