Your truck should get a little better gas mpg due to the increased air flow. Not sure about the smoke thoughJust put a straight pipe on my truck. right when i fired her up it was dumping smoke like crazy but now my gas milage has gone up my gas to empty has gone from 400 miles to 450 mile is that the the engine adjusting to the new air flow?
That's what the 6.0 sounds like at WOT, it's got raspy popping sound to it. Didn't really care for it that much. So I just put the straight through muffler back on and it took care of it.I think you both are the first I have heard that didn't like the straight pipe on the 6.0. I know for a fact I wouldn't do straight pipes on a gas truck so thats kind of holding me back from putting it on my 6.0. I know a gas truck and diesel truck are different but all the straight pipe gas trucks I have heard didn't sound that great just alot of crack-a-lackin coming from the tail pipe.