does anyone know of any place that could install a supercharger on my 235 outboard? i understand that the supercharger head unit would be the same, it would just be how it was "plumbed" to fit the engine

Evinrude made a few supercharged and turbocharged outboards, very bad idea. No one has ever been able to figure out how to make them work reliably.

If they can supercharge a Harley, why can't they supercharge an outboard?

A Harley ain't a two stroke

They have never been able to get a supercharger or turbo to work on two stroke engines. Too much boost and your reeds are gone....

You are better off getting a better OB engine. Merc 300X or Go with a reworked Johnrude V8...

Woodsy

There are plenty of people that have had reliable 2 strokes out there, nothing main stream that was ever reliable but they do exist. I had a Honda 250R three wheeler that I put a small turbo off a Mercur on and after alot of tuning I got it running well enough to tear a ligament in my knee The confines of the Outboard cowling make it much more complicated to make something work in the space provided and have it work reliably but it could be done.