Breaking speed limits is more than a hobby for remote-control race car enthusiast Marc Davidson ofKenner. Marc Davidson of Kenner holds several world speed records in remote-control car racing. With his car clocking a speed of 120.25 mph, , Davidson became the straight-line speed record holder at the recent International RC Speed Challenge in Fontana, Calif. The two-day competition attracted remote-control race car drivers from throughout the country. And Davidson sped away as the best in his class. “I love doing this. I love to make things go fast and do things they are not supposed to do,” Davidson said.…