FITMENT
- 2017-2023 6.6L Silverado & Sierra Duramax L5P 2500HD 3500HD Diesel engine trucks.
- Note: Will NOT fit Cab & Chassis commercial-style trucks.
DESCRIPTION
Product Overview
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Engineered to meet production constraints, the stock exhaust and intake geometry on L5P Duramax engines present significant flow bottlenecks and contamination risks. The OEM downpipe features restrictive internal bends directly off the turbine outlet, generating backpressure that delays turbo spool and traps exhaust heat. Simultaneously, the factory EGR system continuously feeds carbon-heavy exhaust gases back into the charge-air tract, leading to heavy carbon deposits across intake runners and degraded volumetric efficiency over time.
- Precision-engineered to streamline exhaust evacuation and preserve intake purity, this L5P Downpipe & EGR Delete Kit replaces restrictive factory components with a high-flow downpipe and heavy-duty EGR block-off assembly. By reducing pre-turbo backpressure and isolating dirty exhaust soot from your fresh air charge, it optimizes turbine response, stops power-robbing manifold buildup, and supports clean, efficient engine breathing under load.
Key Features
- Frees the turbo’s outlet by replacing the cramped factory downpipe with larger, smoother 3.5" mandrel-bent tubing that slashes backpressure.
- Halts soot contamination at the source by barring hot exhaust soot from the intake system, cutting carbon buildup and leaving intake components cleaner.
- Cools exhaust temperatures by letting heat shed more easily after the turbo, sustaining lower operating temps under sustained heavy load.
- Eases turbo response by smoothing the exhaust path right at the outlet, sharpening spool-up and boosting overall airflow efficiency.
FAQ
Q: What’s the reason for bundling the downpipe with the EGR delete?
A: The downpipe fixes exhaust-side airflow while the EGR delete handles intake-side contamination. Combined, they provide a more complete airflow improvement than either part alone.
Q: What makes upgrading the turbo downpipe worthwhile on the L5P Duramax?
A: The factory downpipe uses restrictive shapes and limited airflow passages right at the turbo outlet. A larger 3.5" mandrel-bent downpipe opens that path, improving exhaust flow and cutting restriction directly behind the turbocharger.
Q: What advantages does deleting the EGR cooler provide?
A: Removing the EGR cooler permanently stops hot soot from recirculating into the intake manifold. It wipes out sticky carbon sludge, keeps intake air cool and clean, and shields the engine from internal coolant leaks caused by cracked EGR cooler tubes.
Q: Does the 3.5" downpipe help turbo response?
A: By cutting exhaust restriction directly after the turbocharger, the 3.5" downpipe improves exhaust flow efficiency and supports quicker turbo response. For a setup that also removes the factory DPF for even deeper EGT drops, see our 4" DPF Race Pipe & 3.5" Downpipe w/EGR Delete Kit.
