Pedal Commander throttle response controller PC64 for GMC Acadia (2007-2016) and Terrain (2010+) - get increased performance or save fuel up to 20% ELIMINATE RESPONSE DELAYS in your GMCs acceleration EASY plug-&-play installation that DOES NOT void your warranty 4 adjustable modes: Eco, City, Sport, Sport+ (ECO mode can also be used for better traction in snow or off-road) Improve FUEL ECONOMY up to 20% in your GMC with ECO mode PLEASE CHECK DESCRIPTION AND AMAZON FITMENT GUIDE FOR YOUR VEHICLE FITMENT INFO ACADIA (2007 - 2016) TERRAIN (2010 and newer) Allows you to maximize fuel economy up to 20% over the stock ratings. It also doubles as a valet mode to keep a driver (or even your newly licensed teenager) from being able to accelerate above a certain rate. Many of our customers say that city mode allows the vehicle to accelerate as it should have from the factory. It gives you the response of an &#034;old school&#034; throttle cable, with a 1:1 pedal-to-throttle acceleration ratio. Gives any vehicle the response and acceleration of a race car, allowing you to get up and go when you need to without waiting for the ECU to catch up to your foot. Perfect for spirited driving or on a race track. Please use with caution!