You need to have your wife read up on the
MAGUSON MOSS WARRANTY ACT
US Code - Title 15, Chapter 50, Sections 2301-2312
Basically, a dealer cannot void your warranty unless the particular part you installed or modified is what caused the malfunction--and even then, it will only void the warranty on that part or related parts.
Hence, if you installed coilovers and the engine fails due to a faulty piston ring or something, Honda will still have to cover the engine. Now if you installed coilovers and you hit a bump and broke your oil pan or broke some related suspension part, then yea, obviously that wouldn't be covered.
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