Is this the beast you are talking about Mojo?
DIABLO SE 30
The SE 30 was introduced in 1994 to celebrate the 30th ANNIVERSARY of Lamborghini, the engine is tuned, and delivers 520 Hp, more carbon-fibre is used and the weight is 150 Kg. less then a standard Diablo, a traction control system was added and it's the fastest Lambo ever, we thought....
The last 10 cars were even faster, they were called Special Emotion, the engine has other camshafts and a different exhaust system and delivers 585 Hp. It's interior is clothed with alcantara, it has 4 point instead of 3 point safety-belts. Standard is a traction control system, active suspension and a fire- extinguisher system, all cars are Electric Yellow.
15 SE 30's were delivered with JOTA modification, they have a variable in- and outlet system and a straight-through exhaust (they are not road-legal). To get enough air to the engine- compartment it has two air-intakes on the roof, this Jota version delivers 600 Hp. and has a maximum torque of 600 Nm. at 5250 Rpm.
Not sure if this is the same car Mojo is talking about, but here is a pic of a Diablo SE30: