The only thing a advertised "Performance" cdi does is give more advance in the timing curve. Factory stock motors come de-tuned in order to be reliable, dependable and lessen the chance of break downs. Depending on the stock setup, a little timing advance can help alot. There has been some serious testing done to determine if the rumor that there is a rev limit incorporated in some CDI's is true. Non tested were found to have this.
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