you are looking for a coil for short duration like drag racing or tractor pulls, look now further. The Pro Power Coil is designed to produce the most spark when used with an MSD 7,8 or 10 Ignition Control (Racing Ignitions). With 0.03 ohms resistance this coil is capable of producing up to 55,000 volts. With the case constructed out of Rynite material and vibration mounts this Pro Power Coil with withstand the harshest conditions a racetrack will throw at it. The windings stay cool with premium grade oil while brass terminals ensure a full voltage will reach the windings. Note: This Pro Power Coil is designed for short duration applications only. Not for use with any stock ignition or MSD 5 or 6 Series Ignitions. Not legal for sale or use on pollution controlled motor vehicles