Yesterday I did a speed test here in the desert of eastern WA. 86 degrees F, elevation 740 feet, relative humidity 14 percent. 2003 5 spd, 46 lbs air in stock tires. I have no front license plate or right side mirror. The car is polished with several coats of wax. I ran both directions to adjust for any possible wind. I carried my Magellan GPS. Top speed indicated was 117 mph (115.1 on GPS) THIS OCCURRED IN THIRD GEAR, at which time some kind of speed limiter activated, cutting out engine power. It was NOT an rpm limiter, but a mph limiter. In 4th gear I could only do 106 mph, in 5th gear only 99 mph; it is obviously short of HP at those lower rpm's.