There is stuff for outboards. There is some things you should think about
too. Outboards are not engineered with a great deal of extra strength in
the interest of limiting the weight. With any engine increasing the output
is usally a trade off in longevity. Inboards are more forgiving in this
respect that outboards just because there is more metal involved. The other
thing is that it takea whole lot more hp to go faster. For example if your
boat will do 50mph with a 150hp outboard on it, going 65 could take as much
as another 50hp. It's not cheap to get an extra 50hp out of an 150hp motor.
You'd be better off selling your 150 and buying a 200. I have a 300hp small
block and my boat does high 60's. When it had a 205hp small block it did
low 50's.

"JGK" wrote in message
. ..
After watching Monster Garage on Discover (the one where they turn a
pontoon boat into a shark dive boat) I got curious about an item they
added
to the outboard. It was a nitrous system.
I have done a couple of web searches for outboard performance accessories
but have only found
a wide selection of props. Is there any sites that deal with outboard
performance upgrades?
Do them even make any aftermarket outboard performance gear?