Ray San Miguel 0 August 28, 2021 Just installed the Trifecta Performance Tune for my 2014 XTS4 3.6L. Very happy with the results. The vehicle accelerates and shifts and holds gears very well. The car is a lot more fun to drive. You can switch back to the stock tune by turning on the cruise control, so you can really compare the difference. Highly recommend the this tune if you have been thinking of getting one....