FITMENT
- 2015.5-2016 6.6L Silverado & Sierra Duramax 2500HD/3500HD LML engine models with the 3-bolt flange.
- Does NOT Fit 2011-2015.5 model with the V-Band Clamp style.
- Please physically inspect underneath 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" race 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: Why is there a dedicated kit for 2015.5–2016 Duramax LML models?
A: GM updated chassis frame rail hangers, downpipe shield clearances, and sensor connector layouts during the 2015 mid-year transition. This kit is engineered specifically for the 2015.5–2016 platform layout for an exact bolt-on fit.
Q: Does installing an upgraded Turbo Downpipe require removing the EGR cooler assembly first?
A: Yes. The factory EGR cooler sits directly in front of the tight firewall clearance area where the downpipe connects to the turbo exhaust housing. Performing the EGR delete first gives you the necessary workspace to easily unbolt and slide out the restrictive factory flattened downpipe.
Q: What should I do with the unplugged factory wire harness connectors after deleting the EGR valve and sensors?
A: Use the included weather-tight ABS harness plug caps to seal all open factory chassis and engine bay harness plug. This prevents water intrusion, road salt corrosion, and short circuits, preserving your factory electrical pins in mint condition.
Q: Will the CCV (Crankcase Ventilation) reroute cause oil dripping on my driveway or underbody?
A: The kit is designed to route crankcase blow-by gases and oil mist safely down past the frame rail using an extended heavy-duty hose. Under normal operating conditions, it vents fine vapor into the atmosphere without creating messy oil pools or dripping on your driveway.
