The Honda Civic Si HFP comes with front, side, and rear underbody spoilers, sport suspension, a sport muffler, and upgraded alloy wheels and Dunlop tires. How well does a nearly $30,000 Civic perform? To find out, we brought it to the Edmunds test track. Acceleration was tested with 0-60 and quarter-mile tests, while braking was calculated using 60-0. Handling tests included a timed slalom and two trips around a skid pad to generate a lateral acceleration calculation.