What condition is the pump in? Is it brand new? I would say you stick with the A and I'm guessing your pump should be rebuilt. That will lower your RPM's by 400-500 and should give you a few extra MPH.
HBjet
Another question, what boat is this in? If it's a 22ft daycrusier, I wouls say the AA would be the impeller to run, if it's a 19-20 boat, stick with the A.
HBjet
[This message has been edited by HBjet (edited April 23, 2002).]