How do i max out the horsepower on my porsche 911 GT2 in need for speed pro street?

I have need for speed pro street for xbox 360 and bought a porsche 911 GT2 for my speed car. I saw in some races that the GT2 had like 986 bhp and i was wondering how i could do that because i have all the stage 3 parts in it and i can only get it to 752 bhp.|||lolz, put in the flux capacitor of course!!!!|||what u do is you go to update car or customize car and what you do is press dyno test and the results turn out differently depending on what even like drag racing grip etc. hope this helped ya...

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|||Tune%26gt;Engine%26gt;Start Boost/End Boost to max, just gives more hp.. but as far as i can see it doesnt have any effect on the car.

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|||nitro?