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The BEST thing to do is get your plenum Extrude Honed before you slap it back on. Regardless if you get the exterior polished or chromed, the airflow is so much better that you won't even care if the exterior is polished (well, maybe I do...see pics). Besides, it's so much easier to clean the plenum when the inside surface is smoother. By the way, it (Extrude Honing) also jacks up your boost tolerance.
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