Well, do you need the extra performance
I don't understand the mentality...you already have the fastest car on most streets, but you need that extra umph for the occasional Ferrari and Lambo? Remember the GTR is not a Ferrari or Lambo.
Why not just get a kit Ariel Atom?
If you track regularly, and this is your track car than knock yourself out. 0-60 in 2.9 seconds on streets with bumps, pedestrian drivers, and police?
^ My attempt at dissuasion.