What i'm interested to know is, firstly, when people destroy there boxes with stage 1 and say the boxes are shite, they forget to mention that the car has done about 120k, I blew a greabox into a million bits before, it's not that hard, car had done +80k, got a new box, turned up the boost and it hasn't given me any bother and i do launch it regularly, off traffic lights! Car is just stage 3 BTW. I think 400 would be ok, but not if u just used it for trackdays etc.... time will tell i guess.