[villagetinker]

The newer Yamaha are typically the Quietech design which encloses the engine compartment with a plastic (PVC?) tray bolted to the bottom of the cart. The engine exhaust is routed outside this tray by a rubber boot from the exhaust to the tray and the exit is near the center of the golf cart. It MAY be possible to extend the exhaust further back on the cart with the appropriate metal pipe, but I have not heard of anyone doing this on this model, I have seen this on older carts.
I would check to see that the rubber boot is in place correctly and possible consider adding a fan to the plastic panel at the rear of the cart to suck out air from the engine compartment.