I have an R400D with TBs. In theory it's therefore putting out 220hp, but hasn't been rolling roaded. I have had my car from new (2007), and have it set up just the way I like it with race suspension on ZZRs. It handles very nicely and is mainly used on track. However, I could do with a few more horses. My ideal solution would be to find a way to upgrade power without having to completely re-engineer all the oil/water cooling or replacing gearbox/diff. Is there a way to upgrade from 220 and keep the surgery to engine only? Realistically, what sort of upper power limit could be achieved before changes need to be made beyond the engine? And... who would be recommended to do this sort of work?