Pedal Commander throttle response controller PC64 for Cadillac - get increased performance or save fuel up to 20% - Available for CTS, CTS-V, SRX, STS, and XLR ELIMINATE RESPONSE DELAYS in your Cadillacs acceleration EASY plug-&-play installation that DOES NOT void your warranty 4 adjustable modes: Eco, City, Sport, Sport+ (ECO mode can also be used as a valet mode to limit throttle) Improve FUEL ECONOMY up to 20% in your Cadillac with ECO mode PLEASE CHECK DESCRIPTION AND AMAZON FITMENT GUIDE FOR YOUR VEHICLE FITMENT INFO CTS (2008 - 2015) SRX (2004 - 2016) XLR (2004 - 2009) STS (2005 - 2011) 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!