I too have had an ASP .46 and it was a brute of an engine on a mid wing airplane of unknown model. The only issue with it was a carburetor issue where you could not kill the engine due an air leak around the throttle barrel. If you look at the current crop of 91 Super Tigers, they use a similar (if not the same) carb and it has a rubber seal around the throttle arm end. Other than that is performed every bit as strong as the Magnum. That engine was $49 from Sig several years ago and they still offer it.