That's using Rob's dyno numbers of +37 whp plus ~20% due to drivetrain loss yields ~44 crank hp. (Actually 46.25 but I was being conservative) Keep in mind my original post is talking crank hp not wheel hp, because that's what I thought the original posted was talking about (crank not wheel). Getting an SRT-6 to 400+ whp is a bigger challenge. Not impossible, just more money!