FITMENT
- 2001-2004 6.6L Silverado & Sierra Duramax LB7 Diesel
- 2004.5-2005 6.6L Silverado & Sierra Duramax LLY Diesel
- 2006-2007 6.6LSilverado & Sierra LBZ 6.6L Diesel
- 2007.5-2010 6.6L Silverado & Sierra LMM Diesel
- 2011-2016 6.6L Silverado & Sierra LML Diesel
- Note: Specifically designed for the Passenger Side of the vehicle only.
- Will NOT fit 3500/4500/5500 Cab & Chassis commercial-style trucks.
DESCRIPTION
Product Overview
- The 2001–2016 6.6L Duramax engines (LB7, LLY, LBZ, LMM, and LML) are famous for heavy towing, but their factory exhaust up-pipes have a well-known vulnerability. The thin factory flex bellows repeatedly fail under thermal cycling, cracking open to cause severe boost leaks, lost horsepower, elevated EGTs, and loud screeching exhaust leaks under load.
- The High-Flow Exhaust Up-Pipes offer a permanent, heavy-duty upgrade. By eliminating restrictive factory crushes and sealing off exhaust leaks, they restore full drive pressure to your turbo, sharpens throttle response, and keeps EGTs under control.
Key Features
- Extreme Heat & Corrosion Resistance: Constructed from heavy-gauge stainless steel to withstand severe thermal expansion, towing stress, and road salt.
- Increased Exhaust Velocity: Smooth, thick-wall mandrel-bent tubing reduces exhaust backpressure, feeding exhaust energy directly to the turbine wheel for quicker boost response and lower EGTs.
- Fixes Factory Flex Bellow Cracks: Heavy-duty interlocking mesh stainless flex bellows permanently stop exhaust leaks, soot stains, and squeals caused by cracked stock flex sections.
- Direct Bolt-On OEM Replacement: Precision mounting geometry ensures a direct bolt-on installation with stock manifold flanges and factory or aftermarket turbo housings.
FAQ
Q: What are the main symptoms of a cracked factory Duramax exhaust up-pipe?
A: Common signs include a loud metallic screeching or whistling noise under heavy acceleration, loss of turbo boost pressure, soot buildup on the firewall or back of the engine block, and higher towing EGTs.
Q: Do I need a custom ECM tune to install these performance up-pipes?
A: No custom tuning is required. These up-pipes are direct-fit mechanical upgrades that replace factory exhaust piping between the exhaust manifolds and the turbocharger. They work safely on stock or tuned ECMs.
Q: Can I install these up-pipes while the engine is still inside the truck?
A: Yes. While working behind the engine firewall is tight, removing the inner fender liners and downpipe provides sufficient access to unbolt and replace the up-pipes without pulling the engine or removing the cab.
Q: Do these up-pipes feature an EGR riser pipe connection for LLY, LBZ, LMM, or LML models?
A: Depending on the specific option selected (EGR-compatible vs. High-Flow / Delete version), these up-pipes are designed to fit seamlessly with factory EGR setups or high-flow non-EGR applications.
