Exhaust Silencer Insert Identification

The '01 426 I purchased this spring has an exhaust insert that consists of 4 separate tubes that are all a different diameter as well as a different length.

Anyone know who makes these and the general consensus on whether they help/hurt performance?

A pic is always helpful on matters like this

I have a GYTR insert that sounds like what you described, I'm not sure if I have 3 or 4 tubes though.

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