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In reality, and according to some mappers, when rolling roaded, they very rarely hit or exceed the 265PS (261bhp)... Albeit, they are in the 'ballpark'. Splitting hairs.
A lad I know ran his car at RCM, car made just shy of 340. He then drove (same day) straight to surry rolling road. Same car, same day, car ran 360.
Dyno figures aren't by any stretch of the imagination accurate. They are a ball park figure and can vary massively from dyno to dyno. People get to caught up in what bhp their car is when in reality, the way it drives is whats important. Im as guilty as anyone though as I always used to be about the bhp.