there is no VIN range it applies to all 06-08 Civics except gx, hybrid and si (all r18's)
even though its out of warranty it still might be covered based on a "goodwill consideration" by the service manager. so if you get all your work done at the dealer there shouldn't be an issue
here are some pics of where the cracks form, for anyone's reference
exhaust side:
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intake side:
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