I've got a 2010 Limited Ultra with 5k on it and the same persistent problem of oil leaking out under the air filter. It is a stock 103 with a Stage I air cleaner, ECM remap and SE mufflers. So far the dealer has changed the backing plate "o" rings 2X, the gasket once, they installed the upgraded 2011 breathers and after completing a compression and leak down test, the results of which were good, they followed a Tech Service bulletin that required removal of both cylinder heads and drilling out the oil return passages. Guess what, it still leaks. Is there any hope?