I just had my 2013 teryx rebuilt with 840 big bore kit and clutch kit. Put a power commander V on it to try and get some more top end speed. Raised rev limit to 8500. Amazing low end and mid power now, but It still stops at 51 mph! Last ride I hooked computer to power commander and it shows it only hitting 7900 rpm at 51 with pedal on floor? WTH? Anybody got any insight. I also have the auto tune kit with oxygen sensors with PCV. Would be happy to just hit a solid 55mph.