maybe cornering speed is an issue
Nah, in the words of Clarkson 'this thing really handles'
but I read to achieve it you need to contact Bugatti center, for they fit the car with high speed tyres, check it fully and remove electronic speed limiter.
From what I read and saw on Top Gear, all you have to do is stop the engine then insert the key in a slot by the side of the seat, turn it, and the rear spoiler no longer comes up, and the car's ride height alters at the front and rear - that's all you need to do to achieve the Top Speed.
it's already fitted with the Michelin ultra-high-speed tyres.
Does someone have a pic of the layout of their test track?
S'on their website somewhere.
either
http://www.topgear.com or
http://www.bbc.co.uk/topgear
EDIT:
Also the engine seems to need a lot of boost to produce not much horsepower relative to its enormous capacity.
yeh, but it does take humoungous effort to produce such large power, increasing the capacity doesn't work as well when it starts to get enormous, besides, if it relied on being normally aspirated to produce that power... well, you already need 10 radiators to cool it with the turbos