I recommend the Active Autowerke catted downpipe; it's proven to work with no CEL.
Cold start and wide open throttle are noticeably louder than stock
regular driving is almost unnoticeable unless you are a car person.
The car sounds sportier but not obnoxious with downpipes, as it should have...
The only important one is the downpipe code. It sounds like you upgraded the downpipe, triggering the check engine light.
its only a warning so you can ignore it or get a downpipe that does not trigger the check engine light
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Injen in an excellent option; they make a quality product.
Injen is one of the best-value air intakes on the market if carbon is not a must.
ARMA is my first choice if the customer is looking for carbon fiber.