White Brothers Carbon Pro 2 FIM

I plan to buy a Carbon Pro 2 for my '03 YZF450 and since i don' t want an exhaust that makes a lot of noise i saw that there is an FIM version with lower sound ratings than the AMA version. Does anyone know what is the difference betwen these two exhausts? Is it just the end tip or something else?

i didnt know that there was an fim version offered, it must be the 17 inch can. i know they have an fim insert. but maybe its a euro thing.

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