Just cutting 1 1/2 inch foam insulation to fit close to the edges, and then gluing it to the bottom of my Club Car seat board with construction adhesive made a surprising positive difference. Just be careful to provide clearance for the gas line and filter on top of the gas tank. I ride in other gas carts now and am surprised how much louder they are than mine.
Yamahas have noisy mufflers but you can have a shop redirect the exhaust out the back with a better muffler. After test driving new fuel injected Yamahas at the same time as standard ones, they seem exactly the same. I was disappointed in that.
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