What is the elevation of the track you raced on? Im in Salt Lake City, Utah, and our track is about 4500 ft. Cars up here run almost 1 second slower than they do at sea level. Ex: 680 hp civic here ran an all-time best of 11.3. He took it down to Cali and ran a 10.4. Street legal too
(if you own a 12 second car up here, your car is quick!)