I have stock cats and everyone knows stock cbe makes no sound at idle or when driven. Berk cbe has a very very soft rumble at idle and louder rumble around 3k rpm. And no drone on the highway.
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2010 k23
H&R sport springs / Spc rear camber arms / SSR SP1 / Berk cbe / Varis cf lip / Nismo S-Tune side skirts
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