Biondo Baseplate Electric Throttle StopLooking for Exceptional Repeatability in your throttle stop racing? You came to the right place. Biondo's NEW line of Baseplate "#1 Stop" Throttle Stops are available in CO2 or Electric and were designed with the help of years of racer feedback and on-track experience. The result is was to bring you a quality product, at a reasonable price that will bring you years of deadly consistent throttle stop racing.Features:Primary Kit Installed - effectively shuts down all four holes of the carb - primaries, and secondaries, which is a necessity for any racer who has to kill more than 3 tenths of a second. Exclusive Slotted Butterfly Design- tested and proven to be more consistent than conventional butterflies. Eliminates any chance of common fuel puddling that can lead to unstable throttle stop rpm's and bogging problems. Larger 2 1/8" bore for dominator applications means minimal horsepower loss.Exclusive Throttle Stop Adjustment Knob with numbered references. This makes setting and adjusting quick, precise, and repeatable. Standard Holley Application is 2" thick, and Dominator Versions are 1-3/4".1 to 1 primary/ secondary linkage ratio for a more stable (flat) throttle stop rpm.Stainless Steel butterflies, shafts and extra bushing on throttle shaft- all designed for long life and repairablility.Special seals on shafts to eliminate any chance of vacuum leaks.All Aluminum one piece design. No chance of parts coming loose or vacuum leaks due to misalignment.Whether you go with the CO2 or Electric version, we use only the highest quality parts available. Don't take chances- race to win! Electric Baseplate Throttle Stop Uses a heavy duty, one piece electric solenoid with an internal spring. The solenoid is totally sealed to prevent malfunctioning due to dust or dirt. Designed for years of trouble free racing.