I have up-graded the Air Cleaner on my '12 Ultra Classic to the SE high-flow one (see pix below). This kit includes the mounting bolts shown in the first set of photos below that are hollow with a port in the side that vents the crankcase to the air cleaner and engine cylinder intake through ports in the back plate. This allows the oily mist from the crankcase to be sucked into the cylinders and "burned". But I do not like this for a couple of reasons:






Cheers,
TQ
- The oily crankcase vapor accumulates in the air filter area and eventually drips out of the A/C cover onto the engine making a mess
- Burning the oily mist in the engine contributes to carbon buildup and fouling of the IAC over time








Cheers,
TQ
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