 Like previous engines, where the T appears, it stands for forced induction, usually by a turbocharger.Older Volkswagen inline-five-cylinder engines are an adaptation of the original Audi five-cylinder engine (for use in the Audi 4000-derived Quantum).Eurovan five-cylinders are a 2.5-litre non-crossflow 10-valve engine with an extra cylinder and balance rods added.