ORIGINAL: downunder
Most of the car guys alter the crank timing and port timings, polish the crankshaft and cut extra flow channels in them. All of this can result in a 20-50% boost to the imagination
.
And most of them would have been better off just buying fuel, finding a good racing coach, and practicing instead. But, we all seem to think that the only reason the other person won was because he had better equipment.