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.
- Dual-Side Upgrade: Includes both left (driver side) and right (passenger side) high-flow up-pipes with premium multi-layer steel gaskets for a complete system refresh.
FAQ
Q: Is this product a complete set for both sides of the engine?
A: Yes. This kit includes both the Driver-Side (Left) and Passenger-Side (Right) high-flow up-pipes along with all necessary multi-layer steel sealing gaskets.
Q: Why should I replace both up-pipes at the same time instead of just the leaking side?
A: If one factory up-pipe has cracked due to age and thermal stress, the other side has undergone the exact same heat cycling and is likely close to failing. Replacing both up-pipes together saves time, labor, and guarantees a leak-free system.
Q: Will installing this complete up-pipe kit eliminate the loud whistling noise under boost?
A: Yes. That high-pitched screech or whistle under acceleration is caused by pressurized exhaust gas escaping from cracked factory flex bellows. Replacing both pipes with leak-proof interlocking bellows permanently stops the sound.
Q: Can these up-pipes be installed with the engine still inside the truck?
A: Yes. While firewall clearance is tight, removing the plastic inner fender liners and downpipe provides sufficient access to unbolt and replace both up-pipes without removing the engine or cab.
