- From multiple internet calculators, for a car of the R171 SLK55's weight, going from 315 whp (N/A with headers/tune) to 410 whp (supercharged) has a 1/4 mile gain of 1.1 seconds ... for simplicity and conservatism, I'll just use one second.
- When the faster car crosses the finish line, the other car is 1 second away from finishing, and (the slower car) averages about 110 mph over that last second.
- 110 mph = 161 feet per second
- the SLK55 is 161 inches long
- 110 mph for one second is thus 12 car lengths, which is how far behind the slower car is when the faster car crosses the finish line

I want to know how much difference there should be between the two cars, and the above seems like a good estimate, unless I'm missing something big.

I realize the price of the supercharger package, etc. Please only comment about the numbers involved or if you have witnessed a comparable race. Thanks!