I think when you're looking for a 91 2-stroke, you should get one that's the same physical size as a 60. If you're planning on a magnum 91, might as well get the 108, same size, same weight I think without the muffler. In my experience, don't get a magnum or anything of that variety. Generally not as powerful or as user friendly as an OS. Don't even say that your Magnum paperweight 91 will equal my FX (maybe their new series is better than the last...). If you don't want the OS, get the MVVS. Or, if the supertigre is really the same size as their 60, get that. When you get into motors this size, and your bird is more than "a couple hundred" dollars, don't pick up the cheapest motor possible. Sometimes you may do fine, but penny pinchers often end up spending more than the one's who "splurge" on the good stuff...