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Improve your car’s horsepower and throttle response with a high performance Mustang ignition box. They are available for naturally aspirated or supercharged and turbo applications with built-in boost and timing retard. Many have an adjustable rev limiter. They’ve even been known to improve fuel economy due to a hotter spark that improves combustion. Mustang Ignition boxes are available for most years and models and are easy to install.