there was a website with loads of minker info (and all modded XRs infact) but it seems to be down
www.asknik.co.uk was the site
basically it's a sierra XR4x4 with a pretty impressiove twin turbo conversion. it took the TT conversion one step further by essentially "doing things properly" proper pistons, proper management etc. etc. not bodging everything like they do with the cheaper kits.
they were 300+ bhp (the 323 stands for BHP or torque, i cant remember which)
seriously quick cars even considering their low (compared to 500bhp cossies) quoted max power output.
they were also THE fastest sierra you could buy from your ford dealer. quicker out of the box than the RS500, and the rouse sport cossies. infact i
think that theyre the quickest ford you could buy in the UK (bar the GT40)
but, at the end of the day it's only an XR