Patrick
The Zen 50, If you like get a Tuned pipe for that Irvine, pipe it in the tunnel provided, exhaust is down and away from the aircraft. The Flight charcterisitcs of the Zen 50 are very straight from the box to the Air. You'll be amazed at just how easy it fly's. Knife edge is crisp, rolls are straight, stall turns are smooth as well avalanche, sawtooth, hummpty bump Oh well you get the picture. It's really been reemed out in flight so all I can say is that it was alot of fun for such a small aircraft. compared to the Two Meter Brothers.