I recently put a full Leo EVO II on my bike, no PCV or Bazaaz, and it's running excellent! Will you need an additional 1-2hp beyond the 10-12 the exhaust alone will give you, likely not.
I also was told by a friend and professional in the industry that works closely with many S1K race teams, that an aftermarket air filter is not necessary and can likely cause problems with too much air flow, unless one does go with a PCV and remapping.
I'm experiencing what feels like a much smoother power curve, particularly in the mid range, and that's just with the exhaust only. My suggestion, contingent upon if you are racing or not, save yourself several hundred $$$ and just try the exhaust first.
cheers!
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