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Message: <blockquote data-quote="Johny25" data-source="post: 262829" data-attributes="member: 7791">Carburetor and intake manifold, it allows more fuel and air flow creating more HP and a higher RPM. I have a whole thread about this mod that you can do on iboats. Here is the link if you are ever interested in getting a few more ponies for around $100-150 bucks : ) It is good for about 3-5mph top end. But the biggest difference is how well it does with a heavy load after the mod. https://forums.iboats.com/showthread.php?t=532265 It is a really easy mod to do and the results are very good for the money. What you have is a de-tuned 30hp motor with that 25. You have the perfect year johny to do the mod. All you need is a carb and intake off of an older 35hp or a post 84' 30hp</blockquote>