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Pulling a coil is an easy 30min job at most and that includes putting the car up on jack stands etc.
Rusty coil does not make sense as they are completely encapsulated in plastic and no water could get into the sealed plug contact end unless the engine has been under water for days.
Cracked is the common mode of failure for coils.
The spark plug tubes will take a few minutes each once you have the coil out of the tube. (With a good DIY tool for gripping/pulling them)
I would say that 2 hours should be enough time to remove ALL the coils, plugs and tubes laying on your back under the car up on rear jack stands.
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"It broke because it wants to be Upgraded  "
2012 Porsche Performance Driving School - SanDiego region
2001 Boxster S, Top Speed muffler, (Fred's) Mini Morimotto Projectors, Tarret UDP,
Short Shifter, Touch Screen Dual Din Radio, 03 4 Bow glass Top (DD & Auto-X since May 17,2012)
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