www.morepowertu... PR-X, also known as Performance Race Xtreme, is our top-performance tune for the 2015-19 Mustang with a dyno proven gain of 36 HP and 34 ft-lbs of Torque on the 3.7L V6. Due to the impressive power gains and performance mannered driving, this is by far the preferred tune for the 15-19 Mustang. The Mustang feels so much lighter with the increased throttle response and part throttle power. Wide open throttle power is noticeably increased as well. The stock calibration has several dead spots where the car just doesn't feel sporty. This feeling is resolved with the MPT custom tune. With this tune you are looking at huge increases in low end torque and acceleration, faster 0-60 times, quicker 1/4 mile results and shift points optimized with a focus on performance. The shift points will still be fuel efficient at very low throttle positions but will happen at a higher rpm/mph when throttle position is increased. The shifts will also be firmer and more crisp than stock. Sport mode has a noticeable increase in throttle response above that of the already increased base shift mode. We also modified sport mode to make the minimum rpm to shift lower. This lets you drive in sport mode more comfortably and click back into regular drive when you want to be more economy minded. This tune applies to both Auto and Manual transmissions.