Turbo back exhaust systems replace the entire stock exhaust system with a high-flow, mandrel-bent piping design to improve horsepower and torque. They typically include a performance muffler for a sportier exhaust note, and some may even include a high-flow catalytic converter to meet emissions standards. Consider material (stainless steel for durability), pipe diameter (affects performance), and whether a tune is required after installation for optimal performance gains.