4"/5" DPF Delete Race Pipe

The Spelab 4"/5" DPF Delete Race Pipe is engineered for off-road 2017-2025 L5P Duramax owners seeking to enhance their truck's performance. This race pipe eliminates restrictive factory Diesel Particulate Filter (DPF) and catalytic converter components, leading to improved turbo spool-up, better throttle response, and reduced Exhaust Gas Temperatures (EGTs). The mandrel-bent construction ensures maximum flow efficiency, allowing the diesel engine to breathe more freely. Constructed from durable T-409 stainless steel with a 2mm thickness, this pipe offers robust performance and corrosion resistance. For a complete turbo-back system, a compatible downpipe must be installed first, as the factory downpipe has an integrated SCR assembly and cannot directly connect. Installation is estimated to take about 1 hour with basic hand tools and can be done on the ground or on a lift. Clamps, hangers, and hardware are included, though some factory hardware may need to be reused. Cutting may be required for shorter wheelbase configurations. A DPF delete capable tuner is required to prevent check engine lights or diagnostic trouble codes, as emission-related sensors are removed. This DPF delete race pipe fits 2017-2025 L5P 6.6L Duramax Diesel GMC Sierra 2500 HD/3500 HD and Chevrolet Silverado 2500 HD/3500 HD, including both short-bed and long-bed Crew Cab configurations. It specifically does NOT fit Cab & Chassis models (3500/4500/5500). The 4-inch version is recommended for mild/moderate tunes for balanced sound and low-end torque, while the 5-inch version is best for high-horsepower builds to maximize flow and top-end power. This product is intended for off-road or race use only and may violate emissions regulations.