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I installed the Nauticus SX9510-60 which were the recommended size for an 18' boat with 130 hp. I tested them a lot more this past weekend and I have to say I am even more impressed. With a lot of fuel and 5 adults the Ventura got right up on plane every time. There are 5 setting you can use to tweak the performance which I haven't tried yet. I et it in the middle to start as recommended. The only thing I notice is that I might have lost 2 mph from the top speed.