Hey guys been off the site for awhile I'm glad too be back. Anyways I have gotten a lot done to my 6.4 since on last. I have mini , Cai,studs, egr delete,4 inch cold and down pipe,5 in out. Anyways I'm really not getting back on here for first time in while and start a huge debate. My question is this. I been thinking of getting the mcc for ever so I'm gonna get today if I get time. I don't know anything about trying tune a truck. On mcc who is putting out best tunes? Gearhead , Eric Idp or others? Has anyone had both? What fuel milage y'all getting and what about performance? ( speed) again not trying start a debate just trying figure out which way too go. I herd gearhead customer service is Awesome and it can be difficult to contact Eric. Anyways any thoughts would be great. Thks guys.