Equipping your Jeep with a replacement ignition kit gives you quicker starting, added power and more efficient running along with better gas mileage. Kits may contain plug wires, coils, caps and rotors and are compatible with models ranging from Wranglers to Rubicons and more. Reduce your sparkplug gap to boost horsepower and fuel economy with an ignition kit from top manufacturers including Performance Distributors and MSD. Performance Distributor’s D.U.I. Firepower ignition kit is a capable kit designed for 4-cylinder engines and MSD’s Street Fire ignition features and adjustable rev limiter to protect against over-revving.