PPE Boost Increase Valve for 2001 2002 2003 2004 Duramax 6.6L LB7 116030000 PPE Pacific Performance Engineering Brand (NOT Generic). Billet aluminum, CNC Machined construction for unsurpassed fit and finish. Fits 2001-2004 Chevrolet Silverado 2500/3500 Duramax LB7 6.6L. AND 2001-2004 GMC Sierra 2500/3500 Duramax Diesel LB7 6.6L. Increases boost pressure from 18-20 PSI to approximately 23-25 PSI. An easy, effective, and inexpensive way to increase boost for your LB7 Duramax engine. Bright dip hard anodized blue 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. 50 States Emissions Legal - CARB E.O. D-701-13