MTM S4 ECM software modifications are available for both 6 speed and Tiptronic models. With the modification, you will see 306 reliable and honest horsepower and an astonishing 368 lb/ft of torque! Designed with U.S. emissions and gasoline quality in mind and compatible with all dealer diagnostic tools. To order your modification simply give us a call to set up a time to send your original ECM to us overnight, and in turn, we modify your ECM and return it overnight, typically giving only a 48-hour downtime. All software modifications have a 30-day satisfaction guarantee. There is also a lifetime warranty on software and workmanship to the original purchaser.