FITMENT
- 2011-2015.5 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine with a V-Band Clamp.
- Does NOT Fit 2015.5-2016 models equipped with the 3-bolt flange. Please check underneath your truck!
- Please physically inspect underneath your truck to verify your turbo discharge style before purchasing!
DESCRIPTION
Product Overview
- The 6.6L LML suffers from power-robbing DPF regenerations, fail-prone DEF sensors triggering 55 MPH limiters, and EGR gas spiking engine temperatures. Worse, the factory CCV vents oily vapors into the intake, mixing with soot to create thick valve sludge and turbo buildup.
- The LML 4" Delete Kit with Mini Maxx V2 Tuner fixes these issues completely. The pre-loaded tuner clears CEL codes and disables DPF, DEF, and EGR diagnostics, while the 4" pipe, CCV reroute, and EGR bypass lower EGTs, stop intake sludge, eliminate backpressure, and unlock 150+ HP on-the-fly.
Key Features
- Shift-on-the-Fly Performance: Change power settings on-the-fly directly from the cabin display, unlocking additional horsepower and eliminating throttle lag.
- Prevents Oil Sludge: CCV reroute prevents oily vapors from coating intake valves, while EGR delete stops hot gas recirculation to protect engine oil.
- Pre-Loaded Mini Maxx V2 Tuner: Automatically turns off active DPF regenerations, DEF fluid level/heater warnings, and EGR/CCV diagnostics without requiring extra custom files.
- 4-in-1 Delete Package: Removes and disables restrictive DPF filters, DEF/AdBlue urea systems, EGR coolers, and failure-prone CCV reroutes in one order.
FAQ
Q: How does a Downpipe-Back exhaust system compare to keeping the stock rear muffler?
A: A complete Downpipe-Back pipe removes all restrictive underbody mufflers and catalytic traps. This delivers maximum exhaust gas velocity, the lowest possible EGTs under heavy towing loads, and a clean, aggressive V8 diesel exhaust tone with crisp turbo spool sound.
Q: Will the included tuner require sending my ECM out for bench-unlocking before flashing?
A: No. Unlike 2017+ L5P models, the ECM on 2011–2015 LML Duramax trucks can be flashed directly through the factory OBDII port under your dash using the included tuner—no ECM removal, bench unlocking, or mailing required.
Q: Can I leave the disabled EGR cooler mounted on the engine and just install the block-off plates?
A: Yes. You can insert block-off plates to stop exhaust flow while leaving the cooler in place. However, installing the full coolant bypass to completely remove the crack-prone cooler is strongly recommended.
Q: Does removing the DPF and restrictive underbody piping improve highway fuel economy?
A: Yes. By completely eliminating fuel-consuming DPF active regenerations (which inject extra diesel into the exhaust stream) and freeing up exhaust backpressure, most drivers see a noticeable gain of 2 to 4 MPG during steady highway cruising.
