I have a kioti rx8030, a kioti 72” zero turn, and a kioti k92400. The k9 is by far the loudest of all of them. If you dont wear hearing protection youll go deaf. It also runs like a clapped out 1950’s diesel, not a smooth modern engine. For the money they demand i am pretty disappointed. Its a passenger vehicle so it needs to be better. Previously i had a 25 year old kawasaki mule diesel that was also 1000cc and it ran way smoother and way quieter. I find the k9 a little gutless going up hills. My one is a demo so its about a year old but only has 14 hours on it and there are plenty of rust spots showing already. It tends to engine brake when i want it to coast, and it coasts when i want it to engine brake. Gets on my nerves. I have started using two feet on the peddles to rev the engine occasionally to keep the engine braking engaged. For the price of them they should be way more refined.