WCFab's LLY, LBZ, LMM 3" Intercooler pipe for 2004.5-2010 Duramax offers improved airflow into the turbocharger compared to the stock intercooler that's only 2.5". With better airflow, you'll notice a more responsive turbocharger and lower exhaust gas temperatures (EGTs). WCFab's Intercooler pipe fits on stock trucks, no programming required. On a tuned truck, WCFab's Intercooler helps prevent blown boots thanks to our better-than-stock beadroll and wire reinforced boots - an important requireme