I've found that custom seats leave a gap between the body and seat which allows engine noise to come through. I use foam tape available at Ace and walmart that is a peel and stick to fill that area. Glue side down to body and seat bottom rests on the top of the foam. Helps somewhat. I also run a tailpipe out the rear of the cart made from conduit from Lowes or Home Depot. Both of these together made quite a difference in both our 2015 Yamahas.
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