Hello everybody, have something new again and need your help and experience again…I had a K&N 57i sports air filter installed yesterday. Everything nice and good, great intake sounds…if there is not this other constant noise during the gear change. Sounds like a whirring turntable running to the end…if it’s cold the noise is really loud, over 3000 turns hard to bear. A real crash…if the engine gets warm then we get warm d it then slowly quieter, but unfortunately still does not completely disappear when changing gear. My question, is this all normal??? And what is a forge valve??? Questions about questions…Many thanks in advance for your help… Marco from Cologne