First of all, I'm not surprised you kept up. Your car makes up for its power disadvantage with several things. One is AWD. Your power is going to all four wheels, reducing the power lost to wheelspin to an absolute minimum. The Vette is RWD, meaning overdoing the gas can cause wheelspin (and thereby wasting power and time) with as much torque as that car has. Another thing is your turbo. Your engine performs best at high RPM (when the turbo kicks in), with a late-spiking power curve. The power curve on most naturally aspirated V8 engines, like the Corvette's, starts off high and drops off quickly past a certain point. This is why you can burn out so easily in that sort of car. Since your car performs best at high speed, the power outputs of the two cars may have been near equal at the speed you were traveling. There are other things like suspension, remaining tire tread, etc. that could have given you an advantage but those two are the big ones.