The M Factory Helical LSD for the GT86 & BRZ is designed to withstand a lot more power/abuse, and uses a more aggressive tooth profile, which can bias more torque between left/right. Stock is around 66%, M factory can go up to around 75%.

Features:
• Made from imported Japanese Steel
• Forged and Cryo-Tempered for unsurpassed toughness
• Advanced Shot Peening technology increases surface hardness
• Designed to withstand the extreme shock loads of competition-level Drag Racing
• Advanced gear geometry designed using industry-leading software puts more power to the ground
• Only the highest quality Brighton-Best Hardware is used
• Maintenance-free Gears eliminates the need for special fluids & rebuilds associated with plate-type LSDs