OS Giken MZ091-HA Super Lock LSD for 2006-15 Mazda MX-5 Miata (MT Only)

Vehicle Fitment

• 2006-2015 Mazda MX-5 Miata NC 2.0L (manual transmission only; Base, Club, Sport, Grand Touring, Special Edition, SV trims)

Features

• OS Giken Super Lock Limited Slip Differential (LSD) with patented pressure ring design
• Spline-through-side-gear construction allows more friction plates for stronger lock
• Progressive 100% lock capability with smooth, predictable engagement
• Chemically heat-treated high-grade steel alloy components for durability
• Raw-forged gears and precision-machined clutch disks for minimal warpage
• Quiet operation suitable for both street and performance driving
• Tunable initial torque, preload, and lock progression for custom traction behavior
• Ideal upgrade for spirited driving, autocross, or track use

Specifications

• Part Number: MZ091-HA
• Type: Limited Slip Differential (LSD)
• Design: Super Lock with spline-through-side-gear
• Ramp Angles: 25/38 (1.5-way lock behavior)
• Total Friction Plates: 24
• Lock Timing: 336
• Preload Setting: 10S
• Mounting Position: Rear differential housing

Included Components

• 1x OS Giken Super Lock Limited Slip Differential (MZ091-HA)

Product Description

The OS Giken MZ091-HA Super Lock Limited Slip Differential is a high-performance drivetrain upgrade engineered for **2006-2015 Mazda MX-5 Miata NC models with manual transmissions**. This advanced LSD uses OS Giken's patented pressure ring and spline-through-side-gear design, allowing up to twice as many friction plates than many competitor units for fully progressive lock capability. The result is smooth, predictable traction enhancement that improves grip under acceleration, reduces wheel spin, and sharpens cornering response without sacrificing daily drivability.

Constructed from chemically heat-treated, high-grade steel alloy with raw-forged gears and precision-machined clutch disks, this Super Lock LSD delivers durable performance that stands up to both enthusiastic street driving and track use. The unit's preload, initial torque, and lock progression can be tuned through optional spring and ramp changes, allowing custom traction behavior to suit your driving style. Built for motorsport-oriented Mazda Miata owners, the MZ091-HA enhances traction, balance, and confidence in spirited driving applications.