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fmf 4.1 Titanium

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Hello. I have the FMF -Q 4.1 on my wr450. On the website it said this muffler is tuneable, whereas you can add inserts to make more power etc. Anyone know anything about this? I didn't find anything on the site about it other than the mention of it being tuneable. Also, if you remove the "Quiet Core" will this increase HP and what decible range would it move it up to?



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