Biondo Racing can help you out with anything you need just go to their website or call them. I have a DD starting line enhancer in my car but am not currently using it. Its basically a spring loaded lever that you mount next to your shifter that you adjust via a thumbscrew to get your desired leave RPM and it attaches via a cable to the bottom of the carb linkage .. you hold the lever while launching with no need to look at the tach upon launch you just release the lever. I was considering an air shifter for my car but was talked out of it by several racers due to inconsistencies in air pressure etc.