VMS Racing GUNMETAL BOOST INCREASE VALVE Kit with Clamps Compatible with General Motors GM Chevrolet CHEVY Silverado 2500 3500 DURAMAX LB7 6.6L Liter 01 02 03 04 2001 2002 2003 2004 VMS Racing Brand (NOT Generic). Billet aluminum, CNC Machined construction for unsurpassed fit and finish. Fitment = Fits 01 02 03 04 2001 2002 2003 2004 General Motors GM Chevrolet Silverado 2500 / 3500 Duramax LB7 6.6L liter . AND 2001-2004 GMC Sierra 2500 / 3500 Duramax Diesel LB7 6.6L . Increases boost pressure from 18-20 PSI to approximately 28-30 PSI. An easy, effective, and inexpensive way to increase boost for your LB7 Duramax engine. Type II bright dip hard anodized gun metal finish for great looks and corrosion protection. Very simple to install and only takes a few minutes. Comes with Complete Detailed Instructions and hose clamps for correct fitment and bolt-on ease of installation.