This is a 4" DPF/DOC/DEF Delete Pipe to fit a 2011 Ford Powerstroke 6.7. This pipe is a direct bolt in for stock exhaust. You can easily remove for whatever reason and bolt the stock exhaust back on. The use of a DPF Delete tuner is required to use this pipe. This pipe is for OFF-ROAD USE ONLY! Waiver must be filled out and signed before any offroad/racing product ships.