x2???? 450rwhp? on an actual dyno? you must mean HP at the Crank
...and even that would be a stretch, drive train loss is well over 20% on these trucks
Sorry, but there is just no way without boost or spray to reach over 400 at the wheels
That would be a 12 second truck on our track, nobody is close to doing that in an 11' 5.7L Ram with just intake and exhaust.
I'm just barely breaking into the 13's at 320rwhp
Post up some dyno sheets and/or track slips, otherwise ....