Another safety modification was a direct result of Kalitta's death. The NHRA began installing a sensor that constantly checks the car's engine, and should the car backfire at any time during the race, or if the burst panel is blown out by an engine explosion, the fuel pump shuts off and the parachutes are deployed automatically. Although several drivers in the Top Fuel and Funny Car divisions have stated their dislike for the new sensor, they do admit that it should cut down on any fatal crashes similar to Kalitta's. This device was developed by Force, Kenny Bernstein, and Tony Schumacher, along with NHRA racing development, and NHRA track safety. It was implemented at the start of the 2009 season. The sensor is used only in the Funny Car and Top Fuel divisions. Pro Stock doesn't use nitromethane or superchargers in their engines and this presents a much reduced risk of the massive explosions that can be seen in the nitromethane-fueled cars—and often at their peak speeds.