ACCEL coils feature an advanced Bobbin technology, highly specialized silicone magnetic steel cores, along with optimized winding, resistance and turns ratios to deliver 10 - 15 percent more energy than the stock factory OEM coils. More energy equals a hotter spark that burns fuel more completely releasing all it's potential energy translating into better fuel economy and more power that you can feel. 10 to 15 percent more power than aging stock coils Delivers more torque quicker starts instant throttle response better acceleration a smoother idle and improved gas mileage Engineered specifically for 2005 and newer GM LS2 LS3 and LS7 engines Reduces misfire and eliminates hesitation Completely redesigned highly conductive direct plug replacement