Maximum Traction, Maximum Confidence

BMW’s reputation is built on delivering the ultimate driving experience—perfect balance, precise handling, and powerful engines that beg to be pushed. But even the most performance-oriented BMWs have their limitations, especially when it comes to putting power down effectively in aggressive driving conditions. That’s where the OS Giken Super Lock Limited Slip Differential (LSD) comes in.

Designed for a wide range of high-performance BMW models—including the E36 M3 (Euro Only), E38/E39 M5, E46 M3, E60 M5/M6, E8X M, and E9X M3—this LSD transforms the way your car handles acceleration, cornering, and traction. For enthusiasts who demand more from their BMW, the OS Giken LSD is one of the most effective drivetrain upgrades you can install.

What is an LSD and Why Does It Matter?

A limited slip differential (LSD) is responsible for distributing power between the drive wheels. In performance driving, an LSD determines how effectively your car can put power to the ground.

Stock Differentials Often Struggle:

• Open Diffs: Send power to the wheel with the least resistance—bad news when one tire loses grip.

• Weak LSDs: Factory LSDs can wear over time, leading to inconsistent lock-up.

• Limited Locking Range: Many OEM units don’t handle higher torque loads well.

The result? Wheel spin, unpredictable handling, and wasted horsepower.

The OS Giken Super Lock LSD fixes these problems with an engineered solution that prioritizes performance, consistency, and reliability.

The OS Giken Super Lock Advantage

Unlike many aftermarket LSDs that focus on specific lock percentages, the OS Giken Super Lock is designed to provide maximum locking force when needed while still maintaining smooth street manners when off-throttle.

Key Benefits:

• Enhanced Traction: Reduces wheel slip for better launches and corner exits.

• Consistent Lock-Up: Maintains predictable power delivery under high loads.

• Durable Construction: Built with premium materials for long service life.

• Street-Friendly Operation: Smooth engagement reduces noise and harshness.

• Adaptable Performance: Works for both street use and full track duty.

How the Super Lock LSD Works

The OS Giken design differs from traditional clutch-type LSDs in several ways:

• Multi-Plate Design: Uses more friction plates than most aftermarket LSDs, distributing load evenly.

• Progressive Locking: Provides up to 100% lock when needed, but doesn’t engage harshly.

• Heat Resistance: Engineered to handle prolonged high-torque abuse.

• Reduced Wear: Friction surfaces last longer thanks to precise engineering.

The result is a differential that feels seamless in daily driving but transforms into a powerhouse of traction when pushed.

Why Upgrade Your BMW Differential?

Even though BMW M cars are already high-performance machines, the differential is often a weak point once modifications begin.

With a Super Lock LSD, You Get:

• Better Launches: Puts power down evenly instead of spinning one wheel.

• Improved Cornering: Balances traction between inside and outside wheels.

• Confidence on Track: Predictable lock-up under throttle and braking.

• Support for Power Mods: Handles turbo upgrades, tunes, and sticky tires with ease.

Simply put: your car feels sharper, more planted, and more responsive.

Model Fitment

The OS Giken Super Lock LSD is available for a wide range of performance BMWs:

• E36 M3 Euro Only

• E38/E39 M5

• E46 M3

• E60 M5/M6

• E8X M (1M)

• E9X M3

Each unit is tailored for the specific application, ensuring precise fitment and performance that integrates seamlessly with your BMW drivetrain.

Street vs. Track: One LSD for Both Worlds

One of the most impressive aspects of the OS Giken Super Lock LSD is its dual nature.

• On the Street: Engagement is smooth and unobtrusive. No chatter, no excessive noise—just seamless operation.

• On the Track: Under hard throttle, braking, or cornering, the unit progressively locks to maximize grip.

This makes it a perfect solution for enthusiasts who daily their BMW but still want to compete at track days, autocross events, or even professional motorsport.

Supporting Mods for Maximum Benefit

Upgrading to an OS Giken LSD unlocks the full potential of other mods:

• Tires: Stickier tires mean more grip for the LSD to exploit.

• Suspension: Coilovers and sway bars improve weight transfer and traction balance.

• Power Mods: Tunes, forced induction, or bolt-ons become more usable with reliable traction.

• Brakes: More control during corner entry and exit pairs perfectly with high-performance braking setups.

The LSD is the glue that ties all your upgrades together, ensuring none of that extra power is wasted.

Why OS Giken?

OS Giken has a long history of producing some of the most reliable drivetrain solutions in the world.

• Japanese Engineering Precision: Every unit is crafted with exacting standards.

• Motorsport Pedigree: Trusted in endurance racing, drifting, and circuit competition.

• Proven Longevity: Known for lasting significantly longer than many competing aftermarket LSDs.

• Trusted Worldwide: From grassroots racers to pro teams, OS Giken is a go-to name.

When you buy OS Giken, you’re investing in parts built for the extremes.

Who Should Run the OS Giken LSD?

• Street Enthusiasts: Want sharper handling without sacrificing comfort.

• Track Drivers: Need predictable, repeatable performance session after session.

• High-Power Builds: Forced induction or heavily tuned NA engines demand stronger drivetrain components.

• Competitive Racers: From time attack to endurance, reliability and consistency are non-negotiable.

If you’re serious about maximizing your BMW’s performance, this isn’t just an upgrade—it’s a necessity.

Final Thoughts

The OS Giken Super Lock LSD for BMW platforms is more than just a drivetrain upgrade—it’s a transformation. By providing superior traction, smooth operation, and motorsport-grade durability, it turns your BMW into a sharper, more confident machine both on the street and at the track.

If you’ve invested in power mods, suspension, or even just a stickier tire setup, don’t let your factory differential hold you back. With OS Giken, you get a differential built to match the performance of your build.

👉 Ready to lock in maximum traction? Order your OS Giken Super Lock LSD for BMW from Select Speed Shop →