It's noise from the steering assembly itself that is being amplified by the hollow steering column. Go get some pipe insulation (small), take off your steering wheel, remove the upper 'bearing' and slip the foam insulation tube into the column and around the steering shaft.
This is only something needed for the newer style carts with axle mounted steering - 2001 1/2 and up...
There's your freebie from MMT for this month