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2017 which exhaust system is the best for MX

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Done about 10 hours on my 2017 and ready for a exhaust upgrade, which system is getting the best improvement for MX.

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I'm not sure about performance as none of them add a significant enough amount for me to be concerned with.  I went for a combo of the lightest and best looking.  For me, it was the Ti FMF.  It saved around 3 pounds.  I've had several FMF systems over the years and never had an issue with fitment, customer service or durability.  It will lean the bike out slightly though.  Depending on where you ride and what fuel you use, it might need to be fattened up a bit.  If you have access to a KX cal tool, let me know.  I have a pretty good fuel map for that pipe with T4 that I worked out on my 17.  I'm happy to send it to you.

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