Interesting...I just looked on the Berk website and all of there parts are sold "as is" as well. Looks like Stillen is the only company I know of that has warranties. That being said, they may not honor your warranty if corrosion is the claim.
Looking at the HFCs, I can't image what you'd want warranty work or an exchange for. If it's throwing CELs, they'll say you just had bad luck anyway and are in the 5% that have the issue.
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2013 Cadillac V-Wagon, RIP Z
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