I will say this box stock out of the box,it was fast and at the time it was introduced it was the fastest production watercraft period,the F15 would run an honest to God 52 mph right out of the box,bump the compression a bit and you had yourself a monster,the F14 ruled limited class,there was nothing that would touch it stock to stock in that class.Larry Rippenkroger and his wife both competed on these skis.I did a couple of race F15's for some guys out of Tennessee,after I did the the head mods and some slight rejetting they called me back and said on the course they dominated everything bar none,one guy was racing his and the jet pump wasn't even sealed to the hull properly,I knew it immediately when I tested it after the mods,how the hell he didn't notice that one was beyond me.