The Sig Kavilier is an excellent flying airplane. The G-34 will probably do just fine, but of the half dozen or so I've seen or flown, a .40 to .46 was the engine of choice. Airplane would be a bit faster but the vertical performance will be much better. If it were mine, I'd put something like a TT .46 Pro in it. If all that sounds like too much of a hot rod, stick with the G-34.