I went with the EK ZVK3 chain and Vortex aluminum rear sprocket. Not sure if it's "the best" but so far so good. The EK 3D chain looks nice too but I'm not sure the additional cost justifies the extra strength on a 200 or less HP street/strip bike.
17/40 is stock
16/40, 17/42, 17/43, 16/42, or 16/43 will really give it a low/mid range noticeable improvement.
An ecu flash helps too, more lower rpm timing.
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