A vehicle is shown such as a snowmobile, where a frame includes a cooling system operating therein having a plurality of heat exchangers. The modular insulator assembly includes an insulator body attachable to a support member. A converter converts the analog base band signal into a digital signal. A nonmetallic insert is retained by the body adjacent the guide opening to engage at least one alignment flat of the valve lifter received in the guide opening to substantially maintain the angular position of the valve lifter and dampen angular oscillation of the lifter during engine operation. The structure reduces the number of holes for inputtingoutputting sound of a sound device and provides a more elegant appearance with improved function.