The MUV is brand new basicaly. Something like 400 miles on it. We live at a sand belt, so the trails are all loose sand for the most part. My dad has researched about the MUV's lack of power and he isn't the only one, there are people at higher elevations that say they have problems going up a hill, and had to be pulled by another braned MUV. Honda is pretty big on safty since their three wheeler issues, so they really cut back on engine power. The honda 680 MUV's top speed is something like 40mph, the Rincon 4x4 is 60mph granted the Rincon is higher geared, and finally the polaris rzr 700's top speed is 60mph.
Just to point out, both the rincon and the big red MUV are fuel injected engines, so there isn't much tweeking a home user can do.
Just to give you an idea of the size difference... The Rincon's length is about how wide the big red MUV is... my dad's Mazda truck is the same width as the MUV... and it weighs around 1500 pounds. I suspect that it kind of like putting a 1.8L corolla engine in a Ford F250, but with a 33% gear reduction, it should do ok.
Anyway, does anyone think aero mods would even benefit a three wheeler/quad in normal riding?