I'm looking for an engine to put in my P-51. These are the first 2 I am looking at, the SuperTigre G90 and the Satio FA-91S. Here's where my confusion sets in, unless Satio is a much superior company why would it cost more then the SuperTigre for less performance. According to the SuperTigre website the G90 produces 2.5 hp, while the Satio 91 produces just 1.6 hp. What am I missing here?