PPE 3 Inch 304SS Downpipe Upgrade

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Duramax 2004.5-2010 3" 304 Stainless Steel Downpipe Upgrade | PPE 117000500

Upgrade the exhaust flow on your 2004.5-2010 GM 6.6L Duramax with the PPE 3" Stainless Steel Downpipe (Part #117000500). The factory downpipe on LLY, LBZ, and LMM engines uses a restrictive crushed oval design right after the turbine outlet that creates backpressure and limits performance. PPE eliminates this bottleneck with a smooth, mandrel-bent 3-inch round pipe made from premium 304 stainless steel.

This direct-fit upgrade delivers better exhaust flow, helps lower exhaust gas temperatures (EGTs), and reduces under-hood heat. It’s an excellent first step toward a high-flow exhaust system or a smart standalone improvement for daily driving and towing.

Key Features & Benefits:

Mandrel-Bent 3" 304 Stainless Steel Construction — Smooth, unrestricted flow path that outperforms the stock restrictive design while resisting corrosion and high exhaust heat.
Titanium Woven Heat Wrap Included — Spiral-wrapped with high-quality titanium exhaust wrap and secured with stainless steel clamps to contain heat and significantly lower engine bay temperatures.
Improved Performance & Efficiency — Reduces exhaust backpressure for better throttle response and potential EGT reduction under load.
CARB EO Approved (D-701-30) — 50-state emissions legal for peace of mind.
Premium Fit & Finish — CNC-machined flanges and direct replacement design for a clean, leak-free install.
Durable & Long-Lasting — Built to handle the demands of high-performance and heavy-use Duramax trucks.

Vehicle Fitment: Fits 2004.5–2010 Chevrolet Silverado / GMC Sierra 2500HD & 3500HD with 6.6L Duramax diesel engines:

2004.5–2005 LLY
2006–2007 LBZ
2007.5–2010 LMM

What’s Included:

PPE 3" 304 Stainless Steel Downpipe
Titanium woven exhaust heat wrap
Stainless steel clamps
Gasket

Installation Notes: This is a direct replacement (no cutting or welding required in most cases). Removal of the factory downpipe and heat shield can be labor-intensive (often 2–4 hours); professional installation or a second set of hands is recommended. Works great with stock or aftermarket downpipe-back exhaust systems.

Note: V-band clamps at the turbo are not included — inspect and replace if worn.

This PPE downpipe is a proven, emissions-legal upgrade that delivers real-world performance and durability improvements for your 2004.5-2010 Duramax.

Duramax 2004.5-2010 3" 304 Stainless Steel Downpipe Upgrade | PPE 117000500
Upgrade the exhaust flow on your 2004.5-2010 GM 6.6L Duramax with the PPE 3" Stainless Steel Downpipe (Part #117000500). The factory downpipe on LLY, LBZ, and LMM engines uses a restrictive crushed oval design right after the turbine outlet that creates backpressure and limits performance. PPE eliminates this bottleneck with a smooth, mandrel-bent 3-inch round pipe made from premium 304 stainless steel.
This direct-fit upgrade delivers better exhaust flow, helps lower exhaust gas temperatures (EGTs), and reduces under-hood heat. It’s an excellent first step toward a high-flow exhaust system or a smart standalone improvement for daily driving and towing.
Key Features & Benefits:

Mandrel-Bent 3" 304 Stainless Steel Construction — Smooth, unrestricted flow path that outperforms the stock restrictive design while resisting corrosion and high exhaust heat.

Titanium Woven Heat Wrap Included — Spiral-wrapped with high-quality titanium exhaust wrap and secured with stainless steel clamps to contain heat and significantly lower engine bay temperatures.

Improved Performance [...]