The Speed Secrets (Throttle Control Bar) was designed to help you control your throttle "legal traction control" It is a mini spring bar that connects to your gas pedal and either a 1/4"- 28 or 3/8"-24 male threaded throttle linkage. This part will help you control wheel spin, shocking the tires, gain and hold traction longer, helping with pedal control on a rough surface, etc. Note: Two selected carburator return springs are to be used for best results. To adjust or stiffen the spring simply tighten the locking jam nut. Carburetor linkage must be shortened for proper application.