turboback

Turboback, in automotive aftermarket terminology, refers to a type of exhaust modification that replaces the section of exhaust from the turbocharger outlet to the tailpipe. A turboback system typically includes the downpipe, any catalytic converter or test pipe, the mid-pipe, and the rear sections such as the resonator, muffler, and exhaust tip. This is distinct from a cat-back exhaust, which starts after the catalytic converter and does not include the downpipe.

The turboback configuration is used on turbocharged engines to improve exhaust flow and reduce backpressure. Proponents say it can lead to gains in horsepower and torque, improved turbo spool, and a more open exhaust note. Actual performance benefits depend on the vehicle, engine management, other modifications, and whether the system is paired with an appropriate tune. Turboback setups are often louder than stock and can affect weight and sound characteristics.

Considerations and caveats include emissions compliance and warranty implications, which vary by jurisdiction and vehicle manufacturer. Many turboback installs require ECU retuning to optimize fuel trim, boost targets, and sensor readings; replacing the downpipe can trigger check engine warnings if not properly tuned or if a high-flow cat is omitted. Installers should ensure compatibility with the vehicle’s sensors and exhaust routing, as well as local noise and emission regulations.

Turboback is a common term in the tuning community and appears in catalogs and forums for turbocharged cars. It is frequently discussed in relation to popular platforms such as Subaru WRX/STi and Mitsubishi Lancer Evolution, among others, as a high-level approach to exhaust modification aimed at performance outcomes.