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The SCT X4 is a handheld tuner that reflashes a vehicle's computer with preloaded, dyno-tested tune files to add horsepower and torque, sharpen throttle response and firm up shifts. It stores up to 10 custom tunes, logs data at high speed, reads and clears trouble codes, and updates over built-in WiFi. It fits most 1996-2020 Ford and GM vehicles. Enthusiasts like the plug-in simplicity and the shift firmness on automatics; some report a rough first flash, connectivity trouble with WiFi updates, and tunes that don't match the gains claimed for every vehicle.
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Lowest price we've seen: $334.95 on Nov 13 at Parleys Diesel Performance. Tracked across 14 stores since Nov 13.
Owners rate it around 3.8 out of 5. Most praise the easy install and the sharper throttle and firmer shifts, especially on Ford trucks. Complaints center on WiFi update trouble, occasional flash errors and gains that fall short of the claims on some vehicles.
The SCT X4 Power Flash Programmer is a handheld tuner that reprograms a vehicle's computer. It is made to change the factory calibration to improve horsepower, torque, throttle response and shift firmness, and it can also increase fuel mileage.
It comes with pre-loaded dyno-proven tune files and can store up to 10 custom tunes. A full color LCD display shows the menus, and built-in WiFi is used for updates. The programmer also does high-speed data logging and monitoring, and it reads and clears DTC trouble codes. Some vehicle parameters can be adjusted by the user.
