WCFAB 2004.5-2005 LLY Duramax 3" Passenger (COLD) Side Intercooler Pipe KitPowdercoat colors can be found here! LLY, LBZ, LMM Duramax One Piece High Flow 3" Driver Side Intercooler pipe. Replaces the 2 1 2" OEM inter cooler with a full 3" pipe. The OEM Pipe uses a reverse style bead roll design at the turbo which is prone for blowing off of the turbo under higher boost levels than stock. the WCFab inter cooler pipe uses straight high pressure rated boots, no angled boots. 3" Hot Side Intercooler Pipe Silicone Boot T Bolt