Good day, I just got back from having my new Gearhead tune, thermostat, performance spark plugs, and 3 bar Map sensor installed. Man - what a difference. The car shifts super smooth, and just takes off. Very impressed with what just a tune and a few other mods such as spark plugs and a thermostat can do ! I’ve owned my 2014 SHO for over 3 1/2 years and it’s been bone stock. Just over 70,000 miles currently and she’s already had the PTU replaced from Ford, and a complete trans service about 10,000 miles ago.