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Hairline cracks are the shape of things to come.
If you live in a dry climate, the coils may last for many thousands of miles - if you live in a wet, salty enviroment, they may only last ????
The cracks you see are the visual breakdown of the coil insulation - resin composite - and without an insulation resistance tester its difficult to diagnose the depth of the faults.
If in doubt, replace - they are not expensive items compared to HT voltage (spark) breakdowns and CEL problems....
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2001 Boxster S (triple black). Sleeping easier with LN Engineering/Flat 6 IMS upgrade, low temp thermostat & underspeed pulley.
2001 MV Agusta F4.
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