aFe 16-23 Audi A4/A5 / 21-23 Audi A5 Quattro/A6 L4 2.0L (t) Sprint Booster V3 Power ConverterAutomobiles in the 21st century have replaced the more conventional throttle cable technology for an ECM (Electronic Control Module) that translates pedal travel into electronic signals in order to provide power to the wheels. The ETC system (Electronic Throttle Control), also known as drive by wire, has the unfortunate downside of delayed throttle response and subdued acceleration, creating problems in certain circumstances such as up hill starts,