And no i am not talking about the reyland escort.
The fastest uk cossie in a straightline is rod tarry's mad sierra and it's has about 700 bhp on race fuel and 800 bhp+ on race fuel +nos.
And it's running a garett gt 40 and it's geared for 216 mph(345 km/h) it's faster than most supercars on topspeed and the things it's looks like a normal sierra the best street sleeper ever.

Don't try it race it you lose.
You can never see from the outside what engine spec a cossie is running.
But the rallycross/hill climb sierra and the beast of rod tarry have the same problem not traction from a standing start.
But mid-range acceleration is like a fucking rocket not many cars can stay whit a high power rwd cossi.
And the aaserud cossie has a faster 0-200 km/h time 8.5 seconds than the mad sierra 9,47 seconds.