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I've seen oem dizzys go as high as 600..but you better have a Damn good tuner....I personally wouldn't which is why i run d585 coils...but for 450 - 500 you shouldn't have any problems just get a good plug...if you are using a s13 you should upgrade to a msd blaster coil...super easy to wire in and there is a how to on ka-t.org
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