GTI, GTS and GTR (2017 and up), GTX, RXT and RXT-X (2018). Activates ski mode. Offers a choice of different preset acceleration curves for perfect launch every time when towing a skier or wakeboarder, plus steady tow speed. User-friendly interface on gauge. Simple plug-in connection. Includes hardware necessary for installation. Note: Harness (278002569) and 3 amps. fuse (710001008) are required to install on 2011 to 2017 models.