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When I was running a somewhat similar setup;

100mm 11:1, stg 2, No airbox, Pro-design single K&N, CT pipe w/ 16 discs, no porting, stock valves @500' of elevation

I ran 180/185 mains, 30 pilots, and CT needles (similar to GYTR and DJ I'm told) on 3rd clip. This was a winter setup where temps ranged from 40 to -20 degrees F. My bike made less power w/o the discs and endcap.
 

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Super Moderator
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Never tried the 27.5's, jumped from 25 to 30 to keep idle up and starting easier in the cold.

My bike always seemed to be happier with bigger jets than I should have been using, the pilots here is one of those instances.

As for the cap/discs my bike lost a lot of midrange with the open end w/o cap and didn't feel any stronger up top.
 
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