FITMENT
- 2006-2007.4 Chevrolet Silverado Duramax LBZ 2500HD / 3500HD.
- 2007.4 Chevrolet Silverado Duramax LBZ 2500HD / 3500HD Classic.
- 2006-2007.4 GMC Sierra Duramax LBZ 2500HD / 3500HD.
- Note: Does not fit Cab & Chassis commercial trucks or later LMM engines.
DESCRIPTION
Product Overview
- Restrictive OEM up-pipes, narrow intake elbows, and factory EGR systems create severe breathing bottlenecks on LBZ Duramax engines. The stock passenger-side up-pipe restricts exhaust gas velocity before the turbine housing, while narrow intake geometry and continuous EGR soot recirculation choke charge-air intake and cause heavy carbon buildup.
- This LBZ Upgrade Package combines a high-flow up-pipe, a 3" mandrel-bent intake elbow, and precision EGR delete hardware. By relieving pre-turbo backpressure and isolating dirty exhaust gases, it accelerates turbo spool, stops intake sludge formation, and maximizes overall volumetric efficiency.
Key Features
- Puts a riserless high-flow up-pipe in place of the factory passenger pipe, delivering a smooth, obstruction-free path that sends exhaust velocity into the turbo housing soaring.
- Swaps the restrictive OEM intake bridge and valve body for a smooth 3" mandrel-bent elbow, maximizing the cold air volume reaching the intake manifold.
- Removes the heavy factory EGR cooler and valve assembly to permanently halt abrasive soot contamination and erase internal coolant leak risk.
- Boosts turbo spool and cuts EGTs by clearing pre-turbo restriction and intake turbulence, letting the turbocharger come on noticeably quicker while easing EGTs under heavy towing.
FAQ
Q: Why does this kit include only the passenger-side up-pipe instead of both?
A: On 6.6L Duramax engines, the factory EGR system connects directly to the passenger-side up-pipe via a restrictive riser. Replacing this specific side with a high-flow, riserless pipe eliminates the EGR restriction and restores smooth, uninterrupted exhaust flow straight to the turbo.
Q: What is the benefit of upgrading to the 3" intake tube over the stock intake bridge?
A: The factory intake bridge is narrow and severely restricts airflow due to internal EGR passages. Our 3" high-flow intake tube removes these bottlenecks, providing a smooth, high-volume pathway from the intercooler to the engine for noticeably faster throttle response and improved efficiency.
Q: Will deleting the factory EGR riser reduce turbo lag?
A: Absolutely. The stock up-pipe riser bleeds off valuable exhaust energy into the EGR system. By removing the riser, 100% of the exhaust gas is directed straight to the turbocharger, resulting in quicker spool-up, reduced lag, and a more responsive pedal feel.
Q: Do I need to buy new exhaust gaskets separately for installation?
A: No additional purchases needed! The kit includes heavy-duty, multi-layer steel (MLS) high-temp gaskets and fresh hardware. Replacing aged, heat-fatigued factory gaskets is essential to prevent pre-turbo exhaust leaks that cause loss of boost pressure.
