Description

The 2004–2005 Duramax LLY 6.6L 4″ DPF Delete Pipe & EGR Delete Kit is designed to deliver top-tier performance, improved fuel efficiency, and long-term durability. Constructed from T-409 stainless steel , this 4″ downpipe-back race exhaust system replaces restrictive factory parts, eliminating the catalytic converter, DPF filter, and EGR system. The result is smoother airflow, reduced soot buildup, and cleaner intake performance . Precision TIG-welded seams are pressure-tested for leak-free reliability, while OE-style hangers simplify installation. By reducing exhaust gas temperatures (EGTs) and increasing flow, this kit helps your engine run cooler, breathe easier, and perform at its best. Optional muffler installation is available for drivers who prefer a quieter exhaust tone without compromising performance. ✅ Features & Benefits 4″ downpipe-back DPF delete pipe (T-409 stainless steel) Removes catalytic converter, DPF filter & EGR restrictions Precision TIG welds, leak-tested for durability Reduces soot buildup & intake clogging Improves fuel economy and overall engine efficiency Lowers exhaust gas temperatures for better engine health OE-style hangers for simple installation Muffler option available for a quieter exhaust ⚙️ Fitment 2004–2005 Chevrolet Silverado 2500/3500 HD (6.6L Duramax LLY) 2004–2005 GMC Sierra 2500/3500 HD (6.6L Duramax LLY) Will not fit Cab & Chassis trucks 📦 Package Includes 1x 4″ DPF Delete Pipe 1x Nickel-Plated Steel Exhaust Block-Off 1x Coolant Hose (430mm / 17″) 1x High-Flow Intake Elbow 2x Hose Clamps 1x M10 x M20 Hex Head Bolt 2x M8 x 30mm Allen Bolts 2x M10 x 30mm Hex Bolts 2x M8 x 20mm Hex Bolts 1x High-Flow Intake Elbow Rubber Seal (O-ring) 1x Reroute Fittings 2x Reroute Port Plugs 1x Resonator Plug 1x PVC Pipe 4x Flange Clamps This Duramax LLY DPF & EGR Delete Kit provides a complete solution for owners seeking better power, improved reliability, and maximum efficiency from their 6.6L engine.