We're in the bike room...so all is good!!!
FWIW, the car record in 2009 was a Supra. 246 MPH. For 2010, it's 252 MPH.
I think the GTR is AWD, right?
Are those Supras AWD? For top speed, that wouldn't matter as much, but for time it certainly would if we are talking big power that needs to make it to the ground.
Off topic a bit, this modifying thing is more of an American thing from what I've gathered over my lifetime. I could never understand why anyone would feel good about beating another car or bike unless both machines are perfectly equal. They have races against each other and the guy with more power wins and ends up thrilled.

Of course 100 extra hp will do more. No surprise.