Opps ! I though you were local ! Hmmm .I guess you are but not local to here ! I had a 10hp Petter aircooled stationary once and being in the same shed with it running was NOT good !:eek1 I'd be very interested in something a lot quieter . I'm going to have a look at the Hatz diesels .I don't know if they will fit but they make a variety of quieting mods , down to one you can't hear at all ...it's very bulky though .