My apologies if this was discussed in the past. Searched but still not clear. While my new 2010 Fat Boy Low is still at the dealship, thinking of getting the stage I upgrade done since I have the SE slipons put on already. What do you recommend getting, the breather or the filter? I see that the breather is bit more expensive. Is it just the look? Also, I read something about the fuuler for the stage I update. Is it necessary? I'd like get your advices before talking to a dealership. Thanks in advance.