Performance Tuner/Programmer Marathon Active Fuel Management Module; 2005 To Current GM Vehicles; FEATURES: Easy Installation Saves Fuel Just Plug Into Port Under Dash The DiabloSport Marathon Module helps you get better fuel mileage by enabling your V8 engine to behave like a four-cylinder engine when cruising, while still allowing for full V8 power when you need it. DiabloSport is an industry-leading manufacturer of automotive performance programmers with offices in Ogden, UT and Sanford, FL. As a Holley Performance brand, and division of Powerteq, DiabloSport focusses on making the maximum power, drivability, and fuel economy gains on late model fuel injected vehicles. Founded in 2000, DiabloSport designs and manufactures the industry's most unique line of performance products for the automotive industry. At DiabloSport, we do not wait for others to develop the leading edge technologies needed to succeed, we create them ourselves to gain the competitive advantages that help differentiate us from the competition. In fact we employ degreed individuals in various disciplines. These DiabloSport tuners and engineers are at the very forefront of developing breakthrough technologies for the 21st Century. Most recently we joined forces and resources with Superchips and Edge tuning companies from an acquisition. This collaboration will only solidify our group offering industry leading performance programmers that stay ahead of the technology curves.