Arent the L registration models Williams 1's? The Williams 2 began life in 1994 as an M registration?
200bhp from those mods, impossible. 
150mph+, nope. 
Lexus Lights, woah, get to f*ck.
Large font stickers, remove.
Other than that, and a few other queries, not a bad wee car. Apart from the price and mileage.