Ola, I've read a couple of engine reviews in German "Modell" magazine where they've used a plastic tube from the carb intake to the inside of the firewall so that the engine sucks air from inside the fuse. Remember the intake mufflers from the early 80's? Same thing only easier to make and supposedly quite effective.

How come this is such a problem now, YS 1.60s have been around for some time so how did people pass noise tests at previous EC's and WC's? Option 1 is the obvious answer but still...