No less legal than mass flow efi on a 5.0 windsor with trickflow heads a cam and rockers that has not been emission tested, or sidepipes on the east coast.
Or dash mounted mirrors, or no crash pad on dash top, or no cover over sunvisors, or chrome dash gauge surounds, or polished alloy steering wheels etc etc.
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Cruising in 5th
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Never be afraid to do something new, Remember, Amateurs built the Ark: Professionals built the Titanic.