Hate to trade my truck with C15 but got a big Mpg education this week with a Volvo

On the expansion joint leaking, what would a DOT inspector say about that? It is an exhaust leak, and you could be written up for it, I would have it fixed.

The BD isn't going to make enough power to start causing any trouble, I have not had any issues since putting it on mine, other than this one particular bellows that keeps cracking, but this has only been a problem for the last two months. If it was the BD some how doing it I would have had this problem the whole time. The BD is set up to be 100% safe for the engine, on mine the pyro runs much cooler than stock, the water temp doesn't run as high pulling thru a stiff wind at highway speed, and when pulling west coast grades it doesn't kick the buzzers off nearly as quick as stock.

 

Good deal, that pump being 20lbs below spec wasn't doing you any favors. It will be interesting to see what kind of mileage increase that you will see now.

 

Those things and a good overhead will definitely make a difference. I wouldn't go single turbo. I know guys who have both tuned twins and tuned singles, and for everyday driving, the twin seems to be more efficient, and better jake keeping the Acert.(We be running the hills @80-85K) I would say you should get 6.5 easy out of that truck. I consistently got 6-6.25 pulling a grain trailer, heavy loads as I said, running 65-70 in a 379. But every motor, truck, and driver have their own things that work.