FMF Factory 4 pipe?

Have any of you used or know a friend who uses the New factory 4 from FMF. The anodized pipe looks sweet, but wow what a price tag. It does come with header and jet kit, but it's still expensive.

https://www.fmfracing.com/products/catalog.aspx?CategoryID=38&ItemID=044073

What insert are you guys using for the stock pipe to lessen the noise after the stock insert has been removed? Thanks from a new member..

My bike was never too loud w/o the muffler insert, what WR4XX are you talking about? I have a WR400.

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