Add to Cart Quaife Vauxhall Cavalier / Calibra (F25) Quaife Atb Helical Lsd Differential, Qdh5J €840.54 Quaife ATB Helical LSD differential is suitable for Vauxhall Cavalier / Calibra models with F25 transmission. A direct replacement for the standard open differential, the Quaife ATB Helical LSD differential transforms your car's performance. ... €840.54 Add to Cart