Hello, I have read at various points contradictory statements about the function of the original exhaust systems of the Rosa King and other HD models. I have read, for example, that the left exhaust should not have any function at all and is only there for optics. In other articles I have read that the left exhaust is activated only in certain operating conditions via a flap. Again, it is said that the connection pipe serves for pressure compensation and ensures that that after the emission of the exhaust gases from the cylinder not so much used air is sucked back into the cylinder. Some sounds like half-knowledge and so I don’t know what is right and what is not. I don’t have concrete sources anymore, you just read through. I would be interested in how the original exhaust system really works. Is there any (extensive) information about it? Thank you and greeting D.Mon