Add to Cart Quaife Audi A6 4.2L (01E) Quaife Atb Helical Lsd Differential, Qdf8Q-3 $1,174.68 Quaife ATB Helical LSD differential for Audi A6 4.2l (01E) is a direct replacement for the standard Audi open differential, the Quaife ATB Helical LSD differential transforms your car’s performance. Unlike a conventional plate-style limited... $1,174.68 Add to Cart