9PHX 2015.5-2016 LML Duramax 6.6L DPF & CAT Delete Race Pipe Exhaust 4" for Chevy GMC. Features:. The turbo direct pipe on some of the 2015 models has a V-band clamp instead of a 3-bolt flange. These kits will only fit models equipped with 3-bolt flange and will not work for trucks equipped with the V-band clamp off the turbo direct pipe!. Fitment:. 2015.5-2016 GMC Chevy Duramax 6.6L 2500/3500 pickup with the LML engine. (Short bed crew cab and long bed crew cab. )This kit will only fit models equipped with the OEM-style 3-bolt flange coming off of the turbo direct pipe. Race tuning is required. Will not fit Cab & Chassis trucks.. 2015 or 2015.5?. 2015 is a split year. The 2011-2015 downpipe is secured to the turbo-direct pipe using a V-band style clamp. The 2015.5-2016 uses a 3 bolt flange style connection. Be sure to visually verify the clamp style your truck is equipped with.. Exhaust Material: 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". The exhaust pipe material is T409 stainless steel. A common misconception: unlike T304 stainless steel, T409 stainless steel is still magnetic. So if you are checking to see if you really have stainless steel, keep in mind that the magnet will still stick to it.. Fuel mileage - Expect a significant increase in fuel mileage. If your DPF is clogged, you probably average about 13-14 miles per hour. More or less depending on the degree of clogging. After removing the DPF/CAT, expect a combined mileage of 18-19 mpg. Big tires and poor driving habits will result in lower mileage.. Tuner required. Removal of DPF, CAT, SCR and/or DOC includes removal and elimination of emission related sensors. A tuner with DPF removal capability is required to prevent engine warning lights or diagnostic trouble codes. If you don't already have a tuner with DPF removal capability, we recommend Minimaxx Tuner
