Went to the track tonight and had my buddy bring his 08 6.4 with the spartan 275 tune. Mods are intake, 275 tune, and straight piped exhaust. Its a regular can F-250 ( not sure how much these weight) 4wd xlt so it's not a stripped down work edition. Anyways First pass wasn't to good so I lowered his tire pressures to 35 in front and 30 in rear. Got a best of 8.088 @ 83.99 mph witha 1.74 60ft leaving at around 15psi. I thought this was awsome!! Only did it once but was consistantly running 8 teens to 8.30's the rest of the night. I thought this was the fastest I've heard of the 275 tune going in the 1/8th but could be wrong. Anyways congrats to you guys and Spartan as these 6.4's are turning out to be quite the hot rods!