The Saab 9-3 and 9-5 Turbo models include various sedan, convertible, and wagon body styles. Saab was pioneering in turbocharger technology, releasing its first turbocharged car over 30 years ago. A key innovation was a wastegate valve that releases unneeded excess power, allowing Saab to offer a powerful yet efficient four-cylinder engine. Saab turbos were among the first practical for everyday use due to their ability to efficiently provide the right amount of power as needed through recycling exhaust flow and adjusting compressor boost. This allows a Saab turbo to significantly increase an engine's power without enlarging its size.