PPE HIGH-FLOW EXHAUST MANIFOLDS WITH UP-PIPES 116111400/116111420/116111435 | 2004.5-2005 6.6L Duramax LLY

Increase exhaust flow and reduce backpressure in your 2004.5–2005 GM 6.6L Duramax LLY with the PPE 116111400, 116111420, and 116111435 High-Flow Exhaust Manifolds & Up-Pipes. Engineered to deliver improved performance and long-term durability, this system provides up to 20% greater exhaust flow than the factory components while maintaining 50-state emissions compliance.

Constructed from high-quality cast iron, the manifolds are built to withstand years of demanding use. The included stainless steel up-pipes feature aircraft-grade internally sleeved bellows with an increased inner diameter to improve exhaust flow, reduce restriction, and enhance turbocharger efficiency.

The system is also equipped with built-in bosses that are pre-drilled and tapped for 1/8-inch NPT EGT probes, making it easy to monitor exhaust gas temperatures in performance and towing applications.

Features:

• Increases exhaust flow by up to 20%
• Significantly reduces exhaust backpressure
• High-strength cast iron manifold construction
• Heavy-duty stainless steel up-pipes
• Free-flowing stainless steel inner liner bellows
• Aircraft-grade internally sleeved bellows design
• 11-gauge stainless steel up-pipes with .120-inch wall thickness
• Built-in bosses pre-drilled and tapped for 1/8" NPT EGT sensors
• Designed for improved turbocharger performance and durability
• 50-state emissions legal

Emissions Compliance:

• CARB Executive Order: D-701-1

Fitment:

• 2004.5–2005 Chevrolet Silverado 2500HD/3500HD 6.6L Duramax LLY
• 2004.5–2005 GMC Sierra 2500HD/3500HD 6.6L Duramax LLY