So the point of this thread is that a 6.4 can run a big tune with a stock trans? It's 2008 all over again.:banghead: But here are some results; at obx in 09 I had a stock trans lb7 that limped at 473 HP on dunbars dyno. Next in line was a 6.4 who parked in the way and started loading his tune. Talking to the owner for that half an hour, I found out he also had a stock trans. He proceeded to make 580 rwhp. Later that day I was running 8.2x to his 8.8x. Sorry about the 1/8th times, but you gotta run what the track is.