..the ppl 50..before 2005 will scream with only an air filter and main jet upgrade....
..mine will run over 60 mph...and get there pretty quick, because it's a 2-stroke...
..not had any experience with the S8, but i do know that the 4t is similar in perforance to the agility..
..now, i also have an A50 4t, that i've modded prety much everything except the engine...
..i can get 60 mph downhill, and maintain 45+ on the flats, without too much wind resistance...
..between the 3, the ppl 2t will out-perform them all..
..but as Berg said, the S9 is da bomb!!