I think the biggest NPC single is rated at around 400kws...after that you would need their twin plate that is about 1400$ iirc...there is a lot of debate over which is better single or twin...personally I would go for a twin or even hunt around for a triple for that sort of power as it supplies a better/softer transition...The brute force of a single while effective at getting power down, that load can be tough on your driveline and your crank bearings...Thats my theory anyway I'm sure many will disagree...