Quote:
Originally Posted by mysocal911
What is your sample size, maybe one or two CDIs you've heard? Many exhibit no sound. Your naivety is laughable!
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Had well over 250+ Bosch CDI units through our shop.
Some are quieter than others but genuine 3 and 6 pin Bosch CDI units all squeal / whine when powered.
Easily audible with the ignition on prior to engine running.
(OP, Replica boxes or replacement internals tend not to make a noise)