I have always thought the horn on my SD2400 was wimpy...sounds like a volkswagen beatle. Has anyone found a louder horn that fits in the same cutout as the original horn?
Most of the Hurricane model boats use a Mini "drop-in" horn design. My model uses one that sounds pretty good, so I haven't felt the need to replace it.
I would look on a number of the marine supply websites (iboats, Overton's, Defender, West Marine, etc.), take a look at what drop-in horns they offer (they all have them). Make sure the model you are considering is made of stainless steel, then read the reviews. Most reviewers seem not to want to have a wimpy "Beetle" sound either and they usually let people know if they're satisfied with the tone. Higher amperage models may also contribute to a louder, better sound as well. Most horns are in the 3-4 amp range. Older Hurricanes have a 5 amp horn circuit, newer ones have a 10 amp circuit (check your circuit breaker stamping).