Increase your LB7's potential with this simple but effective upgrade. Back-to-back dyno pulls showed an increase of 15hp with this Fleece Performance high flow LB7 intake horn – that's about the...

The Fleece Performance Intake Air Heater Delete is a simple way to remove the air intake heater on your 2001-2004 GM 6.6L Duramax. Complete with a pre-drilled and tapped ports for a boost gauge,...

ALL NEW! Freedom Series cylinder heads for the LB7 6.6L Duramax now with a cupless injector bore - save time and money with no more injector cups to install, leak, or worry about. Each cylinder head...

ALL NEW! Freedom Series cylinder heads for the LB7 6.6L Duramax now with a cupless injector bore - save time and money with no more injector cups to install, leak, or worry about. Each cylinder head...

The LB7 PowerFlo lift pump is the latest OEM replacement performance lift pump from the diesel experts at Fleece Performance. Direct OEM In-Tank Replacement: The PowerFlo Lift Pump retains the...

Replacement Transmission Cooler Line (short line) for the Fleece Performance Allison Transmission Cooler Line Kit (FPE-TL-LB7-LLY). For use on model year 2001-2005 LB7-LLY trucks. Application Notes...

Replacement Transmission Cooler Line (longest length line) for the Fleece Performance Allison Transmission Cooler Line Kits FPE-TL-LB7-LLY and FPE-TL-LBZ-LMM. For use on model year 2001-2010 LB7,...

Replacement Transmission Cooler Line (medium length line) for the Fleece Performance Allison Transmission Cooler Line Kits FPE-TL-LB7-LLY and FPE-TL-LBZ-LMM. For use on model year 2001-2010 LB7, LLY,...

Replace your leaking transmission lines with our heavy duty, high flow, flexible transmission lines. Our kit is the most complete replacement transmission line kit available for your LB7 or LLY...

Replacement connector with 6" pigtail for use on the 6.6L Duramax engine including MAP, BARO, camshaft, and crankshaft sensors. Produced in-house, our manufacturing process includes fully automated...

Problem: The original equipment oil cooler adapter relies on a metal gasket on the oil cooler that over time is prone to leaking as the cooler flexes. Fix: The Fleece Performance oil cooler adapter...