Ive talked to several race tuners about this and im positive that anything better than about 370bhp will need cams and pistons , but i needed to tune my engine on the new ECU anyway and with the Vanos removed and just a set of rod bolts weve got a sweepstake going as to what power it will make . The whole idea is that the car will be able to do 1 hour or even 24hr races ( its already finished 2 of these ) , so it was sensible to stick it on the Dyno anyway , the power gains are merely a bonus of reliability .