Goekeli, its has a Merlin 160 in it turned down to 120N. The gear is Sandor's (Digitech) full setup retracts and wheels. They are trailing link just like the SM gear but have much stiffer springs and are of generally significantly higher quality (being aircraft alloy for a start!). Im also using Sandor's slightly smaller wheels, i find the tyres are softer and absorb the smaller grass bumps nicely keeping that fine vibration down on teh aircraft (as i fly almost exclusively off grass). But probably the harder tyres would be better for tar.
On the point of the bypass i believe some people have used the bypass from the Cermark ViperJet with success. I would also consider fitting a full bypass.
David, I take your point about landing immediately and in retrospect your absolutely correct. I shall remember that the next time the pilot decides to eject on me