The YXZ can still do 80 mph. If it had a 160 hp snowmobile engine in it, it would probably run 120 mph. There is talk of a factory turbo option but I still think Yamaha will put a rev limiter on it to limit the top speed to about 80 mph. That's about what the turbo rzr and maverick do. They just get there faster than the non-turbo versions. I have seen modified rzrs with monster hp that could go much faster. Usually when they get modified that much, they are 2wd only in most cases. They become full-on race vehicles then.