Turbo Technics did a number of different twin turbo conversions, from 225 right to 323 bhp in the Minker. The kits come up on ebay reasonably often, seem to sell anything from £500 upwards. Alan now deals with these, he bought all the rest of the parts from Turbo Technics when they stopped doing the conversions. Really nice chap and knows his stuff.

I bought my kit second hand about 12 years ago, think I paid about £400 for it but it wasn't complete. I bought the DCU from Alan and used different intercoolers and boost pipes as they were also missing.