I think they totally chose the wrong car, as much as i hate to say it, a Calibra probably WOULD be the cheapest way to 200 over a unlimited distance... (ie autobahn which theyl obv do it as they got no chance at brunters)

Can get em for a grand.
Got less drag than almost anything, inc most supercars.
6spd box is geared for 200mph with the right rims n revs.
2litre 16v turbo engines are good for similar sort of mental power as YBs once the shitty std manifolds and managment are thrown well away.

Theyd of done it for far less than the 25k its cost them to get the lotus in the first place, and FAR more interesting too.

Or a Supra, std bommomends are silly strong so internals can be left alone, another easy 200mph car is you talking autobahn.

I think i got some vids of Nicholas Kiesa (you know, F1 dude) doing an indicated 200odd mph in his R34GTR on the motorway too, and thats got a std bottomend and gearbox...