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CRF450R twin pipe spacing to fit SM wheel. Who is the widest?

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Have a '13 450r that will be running Supermoto this summer. I will need all the tire clearance I can get. If I can ask a favor of you, I would like to know the distance between the mufflers at their narrowest. For example, my stock pipes are 6.25".  Any and all brands welcome!  Also if you can state if there is any flexibility in the pipe joints at the muffler cans. If possible/needed I can put spacers between the subframe and cans to widen them a bit. 

 

Thanks ahead for for any feedback!!! 

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If you are running slicks it shouldnt be an issue. A 170 slick is much narrower than a 160 dot. I run a 170 on a 5" rim on my YZ with no exhaust clearance issues. I know the Honda is a dual but I think the mufflers are actually a bit smaller.

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