The best advise I can give it so race at a track, neither car would even come close to the top speed limiter in a quarter mile pass, plus its not illegal.

ok so all I need to do is upgrade the tires and get it tuned and I should be able to match it'* speed?

Which car is heavier, more aerodynamic and gets the better start is what things will come down to in the end.

Overall though, know your car is pretty equal to the GP.

Do you have heated seats? If so, you can bust his chops about the GP'* only having an option for one heated seat, not two.

The shut off points are set by the government. Repair shops can't legally change this. But you can do it yourself or somebody you know can.