I though tractor pipes was a joke too!

Does the boat have mufflers on it?

I think the tractor pipes (a bit sarcastic perhaps) stick straight up through the engine hatch. This might give you the extra noise you're after........!

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They're not just for tractors and boats.......

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RR

The Corsa tips have silencers built in, change to a tip that is straight through and you will increase the volume. Look inside the corsa and you will see what I mean. I had those on my Donzi 22ZX I drilled out the flat plates that are in there which you could do as well if you don't want to buy new tips.

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And don't forget to play your music extra loud once you anchor or dock.

unplug one spark plug to get a lumpy cam idle

I'm impressed with the hold back of opinions here. I'll share mine, don't do anything you can't easily revert back to. Glass packs on an Escalade would be cool for about a block.

CMI makes Tractor headers. They are not tail pipes. Aprox cost is $5K and up as I recall. NOT what you want on a pleasure boat IMO. I agree on just some straight threw tips.

Bigger motors!