ACES Fuel Injection’s Blackjack™ Pro Ignition Coil is the ignition upgrade to complete your EFI conversion. This extremely powerful ignition coil’s unique design better dissipates heat, and its square shape allows for easy mounting on a firewall or fender. The high-output magnet creates 50,000 volts, or about 70% more spark energy over most stock-style applications, giving you a significantly hotter and larger spark for more complete combustion. This helps create more horsepower and torque, providing smooth acceleration throughout the entire RPM band.