The difference between a stock car & a race prep car is how the car will handle. Ideally, the race prep car should have a higher maximum threshold of traction & speed. Typically, most people on the road can not drive their car to 9/10 of it's maximum. On a race car, the maximum would be much higher. With the stock car, the driver would have to drive his to a higher maximum.
I doubt you can outdrive your 318, and I doubt that spiff can outdrive his car.