I came to find out whoever had mine before me had ported the head some. Bottom end is stock, in short kinda seems as if it had been setup for a bottle. At least the way it sits now even with a tune, its power seems off. Compared to other liter bikes on the same dyno. It makes good power down low then drops off some up top. Kinda as if the added flow is just to much. If it was ported with the bottle in mind, then putting one on again should make it happy. Hopefully find out when spring/summer come back around. Depending on mods and setup may not be worth the money. But as i said i just ended up discovering mine was ported.