Edelbrock E-FORCE Supercharger Stage 1 Street System [TVS Series 2300 | HP 339-345-348 | Torque (Ft-lbs.) 359-381-381] (2003-2007 Silverado & Sierra 1500 4.8L, 5.3L & 6.0L V8) : COLORADOSPEED - LATE MODEL DOMESTIC (AMERICAN MUSCLE) | IMPORT (EUROPEAN | SPORT COMPACT) AUTOMOTIVE PERFORMANCE PARTS