i hate to disagree with the ignorance in this thread, but you cummin's tard's are in for a very rude awakening... 600 with just a tuner is just a few days away... the 6.4 will soon be eating up the cummins. now when it comes to block strength, etc..thats a different story, because its untested and i doubt it will handle the 1000rwhp that the cummins will, but in the capability department..look out. the 6.4 is mean, real mean. if anyone can post a graph over 500 in a CR cummins with just a tuner and intake..please do. i'm a fan of all fast diesel's, but the 6.4 will eat any CR cummins mod for mod... even the tranny is WAY stronger. my CC/SB 4x4 just went 8.40 @ 81 in the 1/8th with just a tuner...thats a 13.0-13.1 ...and i ATE a 24v with gauges on the freeway today...he rolled by with a baby puff of smoke and noise..big mistake.