I ran a K&N kit on my bike for about 4 yrs or so, started having a mystery oil leak issue so I switched back to the stock tube & catch tank setup. Turns out the leak was from one of the side covers that didn't have enough liquid gasket material in there... so no issues w/ the K&N set up at all. I run a STM breather valve on my bike too, wanted to replace the stock valve with a billet part. Haven't had a single problem with the STM.
I think Lightech (?) or somebody else makes a bit cheaper billet/anodized breather similar to the STM. No experience with it though.
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Jesse
1999 900ss ff (the faster red color  )
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