You can replace just the cracked coil, but I would remove and inspect the others to make 100% sure that they are not cracked too.
Even cracked coils work OK untill the first rain shower.......
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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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