Seems 649/650 bhp is the limit according to Kossie, report #254. I'm at 8,000 km and still on 632bhp. Can't grind at night as the car always crashes, no matter, Route X during the day will have to do. edit.... Reached 8,800km before the oil light lit up. Gave me 635bhp, nearly where I was with 10kg ballast. Will grind a bit more before I try Suzuka again.