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I'm with Bob-A and AL in NY . I use the epoxy filled 3 ohm black coil= PN 40611 on my 12 volt roadster . These coils need no resister . Like Bob-A says you'll be glad you did . I get instant starts and improved power that you can feel . Better spark burns the gas better and gets more power from it. The first thing i did after installation was idel down the carbs.The engine ran so much better , it actually picked up quite a few RPMs .The coil is a 40.000 volt performance part but looks like any normal replacement coil . They even have a chrome version if you would like .