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I have a 04 ltz400 with fmf power bomb header and fmf slip on. The jetting is stil Stock. Runs good. But a buddy of mine was saying it would run way to lean on Stock jetting with this exhaust. Thoughts?
 

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If you made no other changes.I would increase the main jet at least one size. These things are already on the lean side, unless you are above 4000 ft or so.
 
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