Quiet Powercore 4

My buddy has a YZ450 with a FMF powercore 4.  I think it has a powerbomb header.  Anyway the bike is absurdly loud.  I realize that it is supposed to make quite a bit of noise but when he cranks it up you feel it in your chest.  We live in a neighborhood and have to ride through it to get to our riding spot.  I saw that FMF offers a quiet core insert (item# 040171) Is this a good solution to quiet it down?  Are there any good alternatives? Thanks in advance.

Might be time to repack that one.

Thats also what I was thinking.  I'm thinking maybe a combination of both will do the trick.

Yes.

Loud pipes lose land. Do everything you can to quiet your bikes down.

Yes.

Loud pipes lose land. Do everything you can to quiet your bikes down.

Exactly.  And get neighbors pissed at you.

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