Boat sounds

Hello my friends I have a question with regards to Boat sounds. I have a 47 inch Australian patrol boat. I want to get a really good sound system. I saw on Harbor models a sound for diesel and also for Chris craft which sounds like the motor when the water goes to the exhaust which I think is really cool. But I can’t seem to find a good sound quality loud system. Can anyone help me or tell me how to make an amplify the sound from the Chris craft louder. Thank you