As i am a Bosch dealer greys will do MAX 460bhp on the absolute limit 450 is stretching but it WILL do it...TBH i aint really interseted in max power flat out....this engine will produce massive boost spikes in 1st 2nd 3rd where it aint held for long enuff to do damage....remember its flat out 5th gear that WILL melt my engine if running high boost....I garantee this engine will piss any production road car in most scenarios other than top speed and thats all thats matters aint it?...For that matter it will piss any 600 plus Cossie on the road IMO..infact in everyones opinion surely 450 bhp thats lo lag.....or 600 plus and 5k till power comes in?