Elevate your GM 6.6L Duramax with the PPE Lower Intake Manifold Kit. PPE casts these manifolds from A356.0-T6 heat-treated aluminum alloy — a strong, corrosion-resistant, thermally efficient material — using permanent steel molds for consistent, repeatable quality. Inlets are 32% larger than factory for a meaningful LLY airflow upgrade, and walls are 50% thicker for added strength, durability, and heat resistance under load.
The kit retains every factory mounting location, including LLY and LBZ/LMM fuel rails, EGR brackets, and fuel line brackets, so installation is a straightforward bolt-on. CNC machined gasket grooves deliver a tight, leak-free seal, a built-in MAP sensor port integrates seamlessly on LLY applications, and a dummy plug is supplied for LBZ/LMM trucks where that port goes unused. New hardware and gaskets are included.
Features:
- High-strength A356.0-T6 heat-treated aluminum alloy construction
- Precision cast using permanent steel molds for consistent quality
- 32% larger inlets over factory for a significant LLY airflow upgrade
- 50% thicker walls for added strength, durability, and heat resistance
- CNC machined gasket grooves deliver a tight, leak-free intake seal
- Retains all factory mounting locations for fuel rails and brackets
- Built-in MAP sensor port for LLY; dummy plug included for LBZ/LMM
- New hardware and gaskets included for a complete bolt-on install
Specifications:
- Brand: PPE
- Part Type: Lower Intake Manifold Kit
- Material: A356.0-T6 Heat-Treated Aluminum Alloy
- Finish: Black
- Casting Method: Precision Cast, Permanent Steel Mold
- Inlet Size: 32% Larger Than Factory
- Wall Thickness: 50% Thicker Than Factory
- Sealing: CNC Machined Gasket Grooves
- MAP Sensor Port: Built-In (LLY), Dummy Plug for LBZ/LMM
- Engine: 6.6L Duramax LLY/LBZ/LMM
- Fuel Type: Diesel
- OEM Reference: GM 97303645, 97303646, 97363571, 97363572
- Warranty: 1 Year Limited
Included:
- (1) PPE Lower Intake Manifold
- (1) MAP Sensor Dummy Plug
- Gaskets
- Installation Hardware
Fitment:
- 2004.5-2010 Chevrolet Silverado 2500 6.6L Duramax
- 2004.5-2010 Chevrolet Silverado 3500 6.6L Duramax
- 2007 Chevrolet Silverado 2500 Classic 6.6L Duramax
- 2007 Chevrolet Silverado 3500 Classic 6.6L Duramax
- 2004.5-2010 GMC Sierra 2500 6.6L Duramax
- 2004.5-2010 GMC Sierra 3500 6.6L Duramax
- 2007 GMC Sierra 2500 Classic 6.6L Duramax
- 2007 GMC Sierra 3500 Classic 6.6L Duramax
Notes:
- 1 Year Warranty
- Warranty does not cover modifications, alterations, or misuse
- Fits LLY, LBZ, and LMM applications
- For LLY applications, PPE Intake Bridge Manifold SKU 115053400 is also required - this combination is port-matched for optimal performance and airflow distribution
- For LBZ/LMM applications, PPE Intake Bridge Manifold and Tube Kit SKU 115053600 is not required but recommended