Custom tune to turn off the rear oxygen sensors.

 

You dont need a custom tune to turn off the o2 sensors. You need a just the tuner itself. The custom tune will tell your truck you have no cats an adjust for that. I got a custom tune from mpt and the "off road x pipe" option on the tune means "no cats" .

 

Are you guys running mufflers? I ran mine just no muffler for a few weeks and my wife was ready to throw me out, it was so obnoxious. I can't imagine what headers, no cats, an x pipe, and no muffler would sound like. Plus you need some back pressure.

 

No need for back pressure on these big engine. A free flowing exhaust with less restriction is the best way to go. Im running OBX longtubes, x pipe, no cats, 2 14" magnaflows, and 2 3.5"tips. I love the sound and all my truck friends are jealous. Not too loud hut it can definitely be heard inside when im parked in the driveway idling.