link was mentioned on type2 list:

http://web95.can05.de/dominik/download.php and then "VWT4 mit 522PS"

it's in German, but briefly the stats:
T4 with 522 hp
Claire (sp?) CT4 993 3.6 L biturbo tuned by Ruf
rear engine !, four wheel drive
19" rimes
max speed 273 km/h
0-100 km/h: 5.1 s
cost: mods: 168000 euro

        Have fun
--
Karl
'81 Westy "Jenny"
Wilmington, DE