It could be any BHP to be honest with you. All depends on launches and gear changes.
Mine has about 425 BHP but because I have only done a couple of runs in the Skyline my best time to date is 13.26 @ 108MPH IIRC
Whereas Milko, who was running standard boost and exhaust and filter was running very low 12's with about 340HP ish.
get your car on a RR to see the BHP.....
P.S. Where in the NW are you?