RE: Sig Rascal 110
James,
We have 9 or 10 Sig Rascal 110s here in Bowling Green, KY. 3 of them are powered with Zenoah G26's(electronic ignition), 1 with a Zenoah G23, 1 with a Saito 180, 1 almost complete on Electric, 1 with a Evolution 26, and 3 others that are not completed yet. As far as powering it with the Zenoah G20, i think you will be satisfied. If you do not have any noise restrictions at your club, i highly recommend the B & B specialties header stack. Below is a photo of my Rascal exhaust. If the stock muffler is anything like the one that came with my G26EI, the cowling will have to be cut up pretty good. This stack was the only one we could find that did not look too bad.
Hope the info was some help to you!
thanks
Eric