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After Market Exhaust

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I am new to the forum and long time owner of a 2008 450x.  I was thinking of upgrading my exhaust system.  Just seeing what everyone else uses, and if you upgraded an exhaust did you open up the air box?  Thanks for your opinions on this.

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I haven't upgraded mine yet but gut the air box and re jet!  Huge difference 

Edited by Bbarker71
Misspelled

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I run a dr d on mine with the baja header. My air box is opened up and carb is rejetted. Bike runs pretty good. 

IMG_2239.JPG

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