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FMF Quiet Core Vs. Rev Tube?

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I'm looking to quiet my race bike down, the 4.1/megabomb combo probably wont pass sound tests stock, plus I hate loud bikes. So I was looking at the FMF website and I see 2 products. I see a 94 DB Quiet Core insert, and a 1 3/8" rev tube available for my FMF 4.1 muffler.

Can someone explain the differences to me?

If it matters, it's a 2007 4.1 series muffler.

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