As an ASE Chief Engineer with 35 years experience the rule of thumb in the ignition components business was OEM only as aftermarket coils, igniters, modules etc just weren't made well. Enter a new era of aftermarket ignition parts that look, feel, fit and perform just as good as original equipment. For the last few years I've tried to get finicky about the components and like these coils I've tested them on an oscilloscope and with a low current probe to check their current waveforms at idle, no load and open throttle. , since the signature of the amperage indicates the work done. Once again I am very satisfied as the coils are top notch.
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