A Cobb OTS tune is a type of performance upgrade that can be installed on a variety of Subaru vehicles. It is named after the company that manufactures it, Cobb Tuning. The main purpose of this device is to improve the car's throttle response and engine output. It does this by tweaking the engine's computer so that it runs more efficiently. In addition to these benefits, a Cobb OTS tune can also improve the car's fuel economy and make it emit less emissions.