2011-2014 powerstroke 6.7 4" turbo down pipe
This down pipe made a pretty noticeable difference in throttle response and exhaust flow.. I needed to adjust my wastegate 2 turns counter clock wise because my backpressure dropped and I started getting black smoke at WOT. My truck has a SCT custom tune, deleted (DPF/EGR)and I have the MBRP filter back as well. The only negative thing I can say about this down pipe is that its a two piece design. I had to re-tighten the included band clamp 3 times because I kept getting smelling exhaust.
WARNING : This will check engine light
This is a great item. My turbo spool up increased tremendously, but since this downpipe is in between the your sensors, check engine light will more than likely happen. Be ready to spend more money after you buy this item. This is not a plug and play. I myself am getting a Cobb accessport. This will tune your engine to get rid of the light. There are other ways to fix the problem, but a tune is the right way.....