Anyone know of a 'speed shop' for outboards? I have been doing work
on my Evinrude 70hp triples for years, and I was wondering if there
were any hi performance parts to push it up to like maybe 100hp.

Bigger carbs? Hypo reeds? Modified exhaust?

I have heard of guys getting 13hp out of the old 5hp 2 cylinder outboards.
Seems there is a whole dedication to modified 5hp racing.