I am wanting to take the stage 1 breather kit of my wifes 08 fat boy and put it on my 09 fat bob, and then in turn put my factory breather on her bike.... Is this possible?????????????

 

As far as the Heavy breather yes they are the same part number. See no reason yours wont go on hers but not sure on that one.

Edit; Sorry thought you said Heavy breather but should still work

 

What exactly do you mean by "breather"? I'm fairly certain the throttle bodies are the same size so if you mean will the a/c backing plates interchange, yes. If you're referring to the breather tubes, I'm not sure.

I put a stock (not Stage 1) 08 softail Crossbones a/c unit on my 07 Street Bob. Had to get the CB breather tubes ($10) - they're longer than the Dyna ones - and one new gasket but otherwise a bolt on.

 

I just changed them both out and they worked fine, just kept the breather tubes with the original air filter...