2007-2010 LMM 6.6L Duramax DPF Delete Kit Exhaust Race Pipe 4/5 Inch for GMC Sierra Chevrolet Silverado 2500 3500 HD. Fitment:. 2007 GMC Sierra / Chevrolet Silverado 2500 3500 HD 6.6 LMM Duramax Diesel. 2008 GMC Sierra / Chevrolet Silverado 2500 3500 HD 6.6 LMM Duramax Diesel. 2009 GMC Sierra /  Chevrolet Silverado 2500 3500 HD 6.6 LMM Duramax Diesel. 2010 GMC Sierra /  Chevrolet Silverado 2500 3500 HD 6.6 LMM Duramax Diesel. DPF DELETE Pipe Kits:. Made from T-409 stainless steel. Unlike T-304 Stainless its still magnetic. So if your testing to see if you actually got stainless; beware that a magnet will still stick to it.. Thickness: 2mm. Inlet Diameter: 4"/5". Feature:. High-performance Downpipe Back Race Exhaust System designed for optimal engine performance. Includes OE-style hangers for easy installation. Enhanced power: Experience a noticeable increase in driving performance. Reduced EGTs: Lower Exhaust Gas Temperatures for a healthier engine. Improved exhaust flow promotes truck efficiency and performance. Better engine breathing leads to increased power output. Optional muffler available for those seeking a quieter, more refined exhaust note. Installation:. Install takes about 1hr with basic hand tools done on the ground of your driveway or garage. Quicker if you have automotive style lift. Cutting may be be required to fit shorter wheelbase bed/cab configurations. Clamps, hangers and hardware are included. You may have to re-use some factory hardware.. Tuner Required: Removal of the DPF, CAT, SCR, and/or DOC involves removing and eliminating emission related sensors. A DPF delete capable tuner is required to prevent any check engine light or diagnostic trouble codes from setting.