6.6L Duramax LML Delete Kit with Tuner | Complete DPF, DEF & EGR Delete | Chevy GMC 2011–2016

Overview The GM Duramax 6.6L LML delete kit is engineered for 2011-2016 trucks that see real work, towing, and sustained load. This complete LML delete kit replaces the restrictive factory emissions hardware with a 4-inch DPF-delete race pipe, full EGR valve and cooler delete system and a pre-configured Mini Maxx tuner built specifically for deleted LML applications. By reducing backpressure and excess exhaust heat, this LML delete kit is designed to lower EGTs, improve turbo response and deliver more stable power and drivability when properly installed and calibrated. Compatibility Year Range Make Model Engine 2011-2015 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML 2015.5-2016 Chevrolet Silverado 2500HD / 3500HD 6.6L Duramax LML 2011-2015 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML 2015.5-2016 GMC Sierra 2500HD / 3500HD 6.6L Duramax LML Exclusions: Not for Cab & Chassis. Verify flange before purchase. Technical Specifications Specification Detail Exhaust Diameter 4.0 inch Exhaust Material Mandrel-bent stainless steel Flange Options V-band (2011-Early 2015) or 3-bolt (Late 2015-2016) Tuning Device Mini Maxx delete tuner with pre-loaded off-road calibrations EGR Delete Components Aluminum intake block-off plate, CNC-machined steel block-off plate, silicone coolant bypass hose Application Type Off-road and competition use only What's Included in the LML Delete Kit Item 2011-Early 2015 (V-band) Late 2015-2016 (3-bolt) Delete Tuning Device Mini Maxx tuner included (pre-loaded delete calibrations) Mini Maxx tuner included (pre-loaded delete calibrations) DPF-Delete Race Pipe 4-inch stainless steel race pipe - V-band configuration 4-inch stainless steel race pipe - 3-bolt configuration EGR Valve Delete Kit Included Included EGR Cooler Delete Components Included Included Coolant Bypass Hose Included (reinforced silicone) Included (reinforced silicone) Block-Off Plates Aluminum intake plate and CNC-machined steel EGR plate Aluminum intake plate and CNC-machined steel EGR plate Hardware and Seals Complete hardware, clamps, and gaskets included Complete hardware, clamps, and gaskets included Included Duramax LML EGR Delete Kit Components Item Quantity / Description Aluminum Intake Block-Off Plate 1 × Plate with integrated O-ring seals Steel EGR Block-Off Plate 1 × CNC-machined steel plate Silicone Coolant Bypass Hose 1 × Reinforced silicone hose with pre-crimped fittings Hose Clamps 4 × High-pressure clamps Socket Head Bolts 4 × Socket head fasteners Hex Head Bolts 5 × Hex head fasteners Important Variant Selection Notice This LML delete kit is offered in two variants based on factory turbo outlet flange design. Selecting the correct version is mandatory for proper fitment: 2011-Early 2015 - Uses a V-band clamp at the turbo outlet. Late 2015-2016 - Uses a 3-bolt turbo outlet flange. Due to production overlap, VIN decoding may be inaccurate. Flange type must be confirmed by visual inspection at the turbo outlet before ordering. Key Features & Build Details 4' Stainless Steel DPF-Delete Race Pipe - Mandrel-bent construction minimizes exhaust restriction and heat retention compared to the factory emissions-equipped exhaust. Complete EGR Valve & Cooler Delete System - Includes precision-machined block-off plates and reinforced silicone coolant bypass hose to fully remove failure-prone EGR components. Flange-Specific Exhaust Design - Available in V-band or 3-bolt configurations to match production-year turbo outlet connections. Mini Maxx Tuner Included - Supplied with off-road performance calibrations designed specifically for deleted LML applications. Full Hardware & Gasket Kit - All required fasteners, clamps, and sealing components included for a complete installation. Performance Benefits Reduced Exhaust Gas Temperatures - Improved exhaust flow lowers EGTs during towing and sustained load conditions. Improved Turbo Response - Lower backpressure supports quicker turbo spool and stronger mid-range torque. Enhanced Power Potential - Optimized airflow provides a solid foundation for performance-oriented tuning. Lower Thermal Stress - Eliminates soot accumulation and heat buildup associated with factory emissions systems. Calibration-Driven Efficiency - Fuel and timing strategies are optimized through included tuning. Installation Notes Installation is rated as moderate difficulty and professional installation is recommended. The vehicle must be tuned using the included Mini Maxx device before removing any emissions hardware to prevent diagnostic issues. Factory exhaust removal may require cutting, and flange type must be visually verified at the turbo outlet prior to ordering. Frequently Asked Questions How do I identify whether my truck uses a V-band or 3-bolt flange? Inspect the downpipe connection at the turbocharger. A circular clamp indicates a V-band flange, while a triangular flange with three fasteners indicates a 3-bolt configuration. Does this kit fit Cab and Chassis trucks? No. Cab and Chassis models use different exhaust routing and mounting locations and are not compatible. What is the difference between 2015 and 2015.5 LML trucks? 2015 is a split production year. Early-2015 trucks use a V-band flange, while 2015.5-2016 trucks use a 3-bolt flange. Because of production overlap, visual inspection is required. Can I add a muffler to this system? Yes. A 4-inch inlet/outlet muffler can be installed for sound control without affecting tuning requirements. Is this Duramax LML EGR Delete Kit? This isn't just a standard Duramax LML EGR delete kit; it is an all-inclusive performance package that includes: Tuner Preloaded LML tuning EGR delete components Required pipes If you are only looking for 6.6L Duramax LML EGR delete parts (such as EGR block-off plates for an EGR-only delete), those items are sold separately.