With over 124,000 miles of ARCA competition and not a single failure, Mallory's CT (Circle Track) Pro Ignition is the right system for your distributor-equipped 4, 6, or 8-cylinder engine. This latest version delivers the same dependability PLUS digital rev limiting (adjustable in 100 RPM increments from 1,000 to 9,900 RPM). So forget about chips & get the most accurate rev limiting with just a twist of two rotary switches! The rev limiter was designed for smooth action and won't upset the chassis. The CT Pro Ignition box is fully encapsulated and utilizes Mallory's exclusive enhanced heat & vibration technology. A 6-pin weatherproof connector plugs into most popular harnesses.