DIESELR Cat & DPF Race Pipe (2011-2015 GM 2500/3500 6.6L Duramax)The DIESELR Race Pipe Duramax LML V band is built to handle extreme duty for 20112015 GM 2500 3500 HD trucks equipped with the 6. 6L Duramax engine. This off road exhaust system replaces the factory cat and DPF section with a high flow, mandrel bent T409 stainless steel pipe that boosts airflow and reduces EGTs. This model is specifically engineered for trucks with a V band clamp at the turbo direct pipe. If your truck is equipped with a 3 bolt