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The sled is an 2002 ZR 600 EFI. Speedwerx in thier catalog claims their billet head will work on it. I can also get reeds(which somebody told me don't gain as much as claimed) and their clutch kit. I am more interested in the head. I am supposed to run premium fuel with the head. I am curious because i was told you couldn't mess with the new EFI. I am going to call Speedwerx but I want some real world experince input before I do. Thanks
 
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