I didn't know the mufflers should be that way for the 370z. I just got burnt tips. One of my tips is burnt on the inside and the other one isn't. Ark told me to (1), leave it that way and eventually they both will be black (2) pay to ship it back to them (3), buy a polishing wheel for my drill and do the work myself. Real nice of them, good luck if you don't like the way they are.
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ark grip ver2 k&n drop-ins
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