i know how to hit 4000 rpms haha i was messing with an edge ez one time and never to try it again, i modified something i wasnt supposed to and put it on the super j. t. special program, i started the truck and it idled fine but when i hit the throttle, the biggest cloud of smoke came out of the stacks and it ran away for about 5 seconds and then shut down and wouldnt start, removed the ez, restarted truck and it had very low power, blew the rail relief the tach was at 4000 and jumping around, it scared the crap out of me and i never tried it again, oh yah it killed the ez too !!!