Whether or not COBB tuning will void your Ford warranty is at the center of a hot debate—while some experts state that tuning the car with a COBB product is protected under the Magnuson-Moss Warranty Act of 1975 that deals with car mods, others argue that the tuning changes fundamental components that can damage the powertrain of your vehicle. A COBB tuning may not void your Ford warranty, but you may have a warranty claim denied as a result.
If you want to tune your vehicle to increase horsepower and torque, go with a safe alternative. A Ford Performance tune will not void the warranty because it’s an official Ford product. However, if you really want to do a COBB tune, wait until your powertrain warranty runs out (five years or 60,000 miles, whichever comes first).