Davis Unified Ignition (D.U.I.) Mini-Stock Ignition Systems are designed to muster all the power possible out of a 4-cylinder engine, delivering ultimate spark and racing advance curve. Available for GM, Ford and Toyota 4-cylinder engines, these simple hook-up distributors are 'stock' appearing for a clean look but pack heavy voltage for greater throttle response and optimal performance throughout the RPM range. D.U.I's mini-stock distributors allow for wider plug gaping, providing cleaner spark plugs and better fuel burning. Each unit is tested for exact tolerances for reliable and lasting performance.