Dedenbear 2 speed CO2 shifters are engineered as a direct bolt on with no modifications required to the most popular drag racing automatic transmission shifters and feature large, oversize cylinders and high flow solenoid valves to ensure the fastest, most positive shifting units on the market. Simply bolt the assembly to the shifter, plumb the air lines, and attach two wires. All parts are plated for corrosion resistance and a professional appearance.