Add to Cart Quaife Porsche 911/901/914 (1969-74) Quaife Atb Helical Lsd Differential, Qdf5Q $1,181.83 Quaife ATB Helical LSD differential is suitable for the Porsche 911/901/914 (1969-74). A direct replacement for the standard open differential, the Quaife ATB Helical LSD differential transforms your car’s performance. Unlike a conventional plate-style... $1,181.83 Add to Cart