APS do a 295bhp@6700rpm & 272lb.ft@4100rpm conversion for around £2000

It involves an ECU remap, plus a free flowing exhaust system and a pair of fitted Schrick cams that have been developed especially for this specific conversion.
APS also do a Haldex performance ECU for £600 fitted.
If you can get hold of the first issue of Performance Tuner mag (April 07) then there is a 5 page feature on this conversion along with a company profile of APS
