Update and questions...

I now have a 91, two 120s and a 125

The cowl with the 91 is a mess! Check my selections to see if I got it right:
Velocity stack for the 91 and 125? http://www.horizonhobby.com/Products...odId=SAI50GK93
Filter for all of them? http://www.horizonhobby.com/Products...?ProdId=BRU204

Thanks for the help. Bill did you ever show how to make the velocity stacks?
I should be breaking in the 125 soon, it's going in the CG Ultimate when construction is done.