My friend used to work at TT when they used to build all there turbo conversions, they made the few Minkers then Geoff started working on the 24v 2.9 version, which one was made and that is his track car, I think around 600 bhp. Actually he also build an estate scorpio (I think), which was around 350 bhp and was his everyday car, a detuned version of his track ca, had TT suspension set up and was 4x4, it was for sale on ebay a few weeks ago.

They used to do a hell of a lot of stuff, turbo golf gti's, turbo 205 gti's, all at low boost, think the 205 was about 200 at 0.9 bar. They even did a K gate YB manifold and made a twin turbo cosworth, shame they gave up building cars as Geoff knows his stuff