2000 R62 with 8.3 Cummins, how much trouble and expense would be involved in turning motor HP up? Can they be turned up to 300hp or 310hp or 325hp ? Running a 30' head with air bar, and 8 row corn head, could just use a little more hp. Small farmer so not really in the mood to trade combines. Have done alot of mods to this one and I know what I got.