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does new exaust mean mandatory rejet

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Short answer is no.

However:

Will it run without a rejet? Yes.

Will it run like crap without a rejet? Maybe.

Will it hurt the motor to run without the rejet? Probably not.

Will it run MUCH better after a rejet? YES!!!!

Needs and wants can be a tricky thing. If you are paying $XXX for the full exhaust bit the bullet and spend the additonal $70 on a JD kit. Comes with a chart that will take 95% of the guess work out of jetting your bike if that is the issue. There are a ton posts and stickys that will help you get it right as well; jetting is wel sorted on this site. If the money for the kit is the issue, then don't buy a full exhaust in the first place and sell the header and keep the muffler only. Full exhaust bonuses are not as huge as it seems: louder isn't always faster.

Mike

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