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If it's on a road course you'll find that the car that handles best is typically the one that wins. It takes an obscene power advantage to overcome the 2-3 car lengths you'll be giving up in every turn.
Having said that...the stock brakes are marginal for any more than 10 minutes or so of track time. Once you get familiar with the track, you'll find yourself going deeper and deeper into the turns until you feel a mushy pedal. A turn or two after that and the pedal WILL go to the floor.
I'd focus on brakes followed by suspension. All the power in the world won't matter if you can't stop.