Well, if you think about it, the engine is the single biggest source of metal rubbing........piston against liner, crankshaft bearings against rods, valves against housing, etc, etc. What better way to transmit all these noise than through the throttle cable ! All you have to do is just create an electrical continuity from the engine to the cable and you have a nice antenna broadcasting metal noise right next to your receiver. Woww, this is what I call HEAVY METAL MUSIC (or noise depending on your receiver's taste) !! Good luck...........