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Discussion Starter #1
I am new to this site , but it looks awesome and i just bought a 2007 DRZ400SM. problem is i want to upgrade from the factory choked up exhaust but i found that many exhaust upgrades require rejetting?
I am currently looking at HR1 or a yosh system. HR1 says they reccommend atleast 4 to 5 primary jets above stock. I am not sure if the yosh requires rejetting or if i should rejet anyway to aviod leaning the bike out? any suggestions would be greatly appreciated, thx.
 
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