Have a 2008 6.7, are there any commanders or programers to increase mileage on these pigs? Been reading about the hypertech. Do these things work or just hype? thanks

 

I think several of the big companies offer boxes for the 6.7 but, they are new and sometimes takes time to get the bugs worked out. IMO, the Smarty is suppose to be coming out for the 6.7's. I'd look in it making that buy !