i was wonering if anyone knows which would be better on my crownline i/o trim tabs or a hydro fin? im runnin about 350 hp.

Try the hydro fin first as you have to drill your transom for the trim tabs. Trim tabs also do not do well for you wake. The one thing I found that helped immensely on our old four winns is dropping to a lower ppitch prop.

A Hydro fin wont do jack on a 22 Ft boat get <BR>The trim tabs they will work much better ! <BR>And dont go cheap buy the good ones.