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With the slip on exhaust do I have to change any thing else besides the muffler or silencer
 

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Jetting may be affected. Keep an eye on how the plug looks or the bike reacts.

Welcome to the forum.
 

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Hi I've been looking on the HMF website and it says tuning isn't required for their Slip on. I guess you will know once you install and see the colour of the spark plug
 

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Hi I've been looking on the HMF website and it says tuning isn't required for their Slip on. I guess you will know once you install and see the colour of the spark plug


When I got my HMF slip on, it had a sticker that said Do Not start without tuning.


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