4" DPF delete pipe for the 2007, 2008, 2009, 2010, 2011 & 2012 Dodge 6.7 Cummins. Bolts to the back of the factory downpipe which incorporates the diesel oxidation catalyst or catalytic converter. It will also bolt up to any aftermarket CAT delete pipe. If you already have a CAT delete pipe this will work nicely. Ideally its best to delete both the CAT & DPF. We recommend the following CAT & DPF delete pipe. If you delete the DPF but leave the CAT in place the catalytic converter is still a major restriction in the exhaust and may plug up in the future. For optimal fuel mileage and reduced EGT's delete the CAT & DPF. This DPF delete pipe is secured using a 3 bolt laser cut flange. Fits all Ram 2500/3500/4500/5500 bed & cab configurations, including cab & chassis trucks. Be sure to make proper selection in drop down menu. Installation takes approx. 1hr, cutting may be required. Aluminized steel is our best seller and the most popular. However, we suggest the T-409 stainless upgrade for those who regularly operate there truck on salted winter roads. When installing a DPF delete pipe it must also be used with a DPF delete capable tuner. Our most popular DPF delete tuner for the 07-12 Cummins 6.7 is the H&S Mini Maxx. After installing a DPF delete pipe expect to increase fuel mileage 3-4 mpg. More or less depending how plugged up your diesel particulate filter is before doing the delete. Typically we see around 18-19 mpg combined mileage. 1 year warranty.