Turbo Dynamics 4 stage ECU reflash for trail riding and racing use. Works on Arctic Cat 2009-2011 Z1 turbo, F1100 turbo XF1100 turbo Comes with their exclusive Knock Light (warning light) that lets you know when the fuel quality isn't up to par and power is being reduced. 4 programs switchable on the fly using a rotary knob. From 200-320HP* switcheable on the fly. Extremely easy to install, only 3 wires to install, no cutting required. 4 programs include the famous: 1- Ecotrail 87-91 octane map 200-220HP (depending on exhaust and intercooler setup) 2- Lake Race 91 octane 220-240HP 3- Powertrail 91 240HP to 260HP most powerful program on 91 octane!!! 4- Racing map for Radar or Drag racing from 280 up to 320HP with wastegate upgrade (requires Race fuel)