MACE PERFORMANCE M78 3.73 DIFF GEAR SET TO SUIT HSV CALAIS VLIf you're looking at upgrading the performance of your vehicle without venturing into engine tear downs or expensive tuning packages, then you can't go past our upgraded differential gear sets. Focused on retaining an appetising affordability to performance ratio, installing a shorter differential ratio is probably one of the most noticeable performance modifications you can do without compromising driveability and compliance. Our Mace differential