Sorry to hear about your loss. Be sure to get another engine, I've had nothing but bad experiences with those SIG engines! You could compare displacements with your SIG and the AX 55, and what an incredible engine it is. Sadly it comes at a premium price, but you won't be sacrificing any planes again from design issues in a cheap engine. If you sell the SIG and FXi, you can easily get into a Thunder Tigre 46 or ASP 52 with some ARF money to spare. I flew an ASP 52 with a OS carb on it, ran like an OS.