Crane Cams 730-0040 PS40 Performance Coil Reliably deliver a high output spark through 6,500 RPM on mild street performance applications. Designed to enhance the output of factory ignition systems. Fit in place of most OEM canister coils. Produces a higher output spark when used with breaker points, amplified ignitions or with the FAST XR-i Points Replacement system Supplied with a ballast resistor which is required if you plan to fire up your original breaker point style ignition system.