You are chasing Ben Woosters R32 GTR and from the article in SPEED here, im pretty sure he's owned it for 4 years and did a total groud up rebuild.
On 1.7bar they are hoping for 350KW at the wheels, on 1.3bar it does 310KW and cuts 11.13sec qtr mile....
Heres a pic of it
http://www.fullboost.com.au/racing/records...tr_woosterb.jpg