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There are two metered cats that come off of the manifolds, then the front Y-pipe. The Racingline Y eliminates the 3rd unmetered cat. I like the Stillen exhaust and I also like the sound. I take my car through the Lazerwash pretty frequently which has the underbody wash, so underneath my car is usually pretty clean which should prevent rust issues with the exhaust. I haven't had any issues with the exhaust yet.