fastest production Lamborghini Diablo

[Diablo_Jota]

ok so what is it?? and not one with a roll cage, i want this thing for the road.
from what i've gathered the Diablo Jota has 595hp and weighs 1450 Kg. (3196 Lbs)
and the Diablo GT has 575hp and weighs 1460 Kg (3218 Lbs)
but which one is fastest in the real world???

info avail isn't the best, stating 340kph top speed for the Jota, while the GT and GTR both have 345kph top speed but GTR is lighter??