I would give FMF a call. When I bought my 05 it came with a Gnarly (05 vintage) and a fatty (09 vintage). The 05 gnarly was all low end and did not rev much at all. Real flat upper mid and top. The fatty was pretty good all over and reved much better. I put a spacer in the fatty and it helped the midrange and it still reved well. I read that the gnarly changed so I purchased one in 11. This gnarly performs right between the old gnarly and newer fatty. This is my favorite of the three.
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