Have a look at this build/fly page, H9 CAP 232 1.20 with MVVS 1.60:
http://home.flash.net/~jecramer/h9cap232.htm
Seems to me I saw the same set-up somewhere in the Dick Hanson domain a couple years back. The new Evolution 26 is basically the same engine. Put their MVVS pipe & header on it and power is no problem. Some people don't like the look of a tuned pipe hanging underneath, in which case you can get the in-cowl can muffler for a better looking, little less but still adequate power solution.