That doesn't prove a damn thing.
A k-series making 300 na is not cheap. For the amount of money they spend to make it 300 whp.
you could have a built and boosted gsr with a lot more power than 300whp.
Still missing the point...he could boost it...and no b series could fuck with it. He did it to prove it could be done. No b series could ever reach those numbers n/a.