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Limited Slip Differentials
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This product was last offered at the strikethrough price on
05-03-2026
This product was last offered at the strikethrough price on
05-03-2026
Convert your open differential to a locked differential without the costly expense of an LSD replacement.
Get your car ready for aggressive track driving or drifting without purchasing or replacing your differential. The weld-in plates strengthen your diff and allow both wheels to engage simultaneously giving you a more predictable and capable track car.
An open differential allows the wheels to spin at different speeds and sends power to the wheel with the least amount of traction. This may be a good feature for your regular everyday driver but limits you on the track. The weld-in plates simulate a driving experience similar to a limited-slip differential allowing you to put power to both wheels in a low traction area or initiate drifts.
Features and benefits:
Added strength to your differential gears
Converts from open differential
Fabricated to fit in the spider gears for an easier weld and increased confidence
Made from 7 gauge mild steel, formed to fit
Introducing the Wavetrac® Torque Biasing Differential by Turner Motorsport, the pinnacle of innovation for your BMW. This cutting-edge technology takes your vehicle's performance to a whole new level. With its patented design, the Wavetrac® differential is a trailblazer, automatically enhancing grip when navigating low-traction conditions. Its approach is truly revolutionary, setting it apart from other torque biasing differential designs.
Quality is the hallmark, featuring high-strength 9310 steel gears enclosed in case-hardened billet or forged steel bodies. Throughout the differential, ARP® fasteners are used, ensuring superior durability and performance. What's more, the Wavetrac® differential is virtually maintenance-free, promising a lifetime of service without the need for rebuilds.
To provide added confidence, all Wavetrac® differentials are backed by a transferable limited lifetime warranty, highlighting the product's reliability and longevity.
For vehicles equipped with a welded ring gear, the installation process requires the removal, drilling, and installation of the welded ring gear from your stock differential. This intricate task should be entrusted to a professional machine shop. To seamlessly install the ring gear onto the new differential, you'll need Bolt Kit ES4368731. It's imperative to consult your machine shop before purchasing this item and the necessary hardware kit.
Please be aware that no technical drawings or instructions are provided, underscoring the importance of verifying compatibility and ensuring correct installation with your chosen machine shop. Refunds or replacements will not be offered in the event of incorrect ring gear installation or differential failure due to improper installation.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
MSRP stands for Manufacturer's Suggested Retail Price. This is the suggested retail price provided by the manufacturer, supplier or seller.
Gaining a prominent edge over the competition is now within reach, thanks to the MFactory Helical Limited Slip Differential offered by Turner Motorsport. This Helical LSD ensures a seamless and uniform distribution of power to your BMW's wheels, significantly enhancing traction whether you're on the street, strip, or track. It's an absolute necessity for BMW enthusiasts.
Curious about the LSD's role? Without it, your car essentially operates as a one-wheel-drive machine, delivering torque solely to the wheel with less grip. This is where the Helical LSD shines, as it allows both wheels to receive power by limiting the speed difference between them, in contrast to the open differentials found in most vehicles.
Break-In Procedure: For optimal performance, it's recommended to change the fluid after the first 3-400 miles of use.
Please note that any defects or warranty claims should be directed to Team MFactory.
Upgrade your BMW S54 3.2L & S65 4.0L Engines with the Turner Motorsport Wavetrac Limited Slip Differential. Featuring patented Wavetrac® design, this innovative differential automatically enhances grip in low traction conditions, providing superior performance compared to traditional designs. Crafted with high-strength 9310 steel gears and ARP® fasteners, this differential ensures durability and reliability. Maintenance-free and backed by a limited lifetime warranty, the Wavetrac® differential offers peace of mind and exceptional performance for your BMW.
The Wavetrac® Torque Biasing Differential introduces an innovative solution for BMW enthusiasts. With its patented design, the Wavetrac® differential automatically enhances grip in low-traction conditions, setting it apart from conventional torque biasing differential designs.
Crafted with precision, the Wavetrac® differential features high-strength 9310 steel gears encased in case-hardened billet or forged steel bodies. ARP® fasteners are utilized throughout the differential, ensuring robustness and exceptional performance.
One of the defining features of the Wavetrac® differential is its maintenance-free design. Fresh from the factory, it's engineered to deliver a lifetime of service without the need for regular maintenance or rebuilds. To bolster the commitment to durability, all Wavetrac® differentials come with a transferable limited lifetime warranty.
For those seeking additional technical insights, comprehensive information on the Wavetrac® Differential can be found at this link: Wavetrac Technical Information.
It's important to note that the Wavetrac® differential is compatible with gear ratios of 3.15 and higher.
For vehicles equipped with a welded ring gear, the installation of this differential necessitates the removal, drilling, and installation of the welded ring gear from your stock differential. A Bolt Kit ES4368731 is an essential component for installing the ring gear onto the new differential. We strongly recommend consulting with a professional machine shop before purchasing this item and the necessary hardware kit. Please be aware that no technical drawings or instructions are provided, underscoring the importance of verifying compatibility and ensuring correct installation with your chosen machine shop.
It's crucial to be aware that no refunds or replacements will be offered if the differential has been installed or machined, or in the event of incorrect ring gear installation or differential failure due to improper installation.
Upgrade your BMW's drivetrain with this comprehensive kit that includes a new pumpkin for a hassle-free bolt-in replacement. Plus, enjoy the added benefit of a $500 refundable core charge. For any defects or warranty claims, please directly reach out to Team M Factory.
The best way to gain a prominent advantage over the competition is to do it with the MFactory Helical Limited Slip Differential. The smooth consistent distribution of power to the wheels with the MFactory Helical LSD puts the power-to-the-ground and maximizes your vehicle's traction. A must for any car be it street, strip, or track.
What exactly does an LSD do you ask? Without an LSD your car is actually 1 wheel drive, in that it can't supply torque to both wheels at the same time and will only supply torque to the wheel with less grip, which is what the shortfall is to an open differential (what most vehicles have).
An LSD only lets the wheels spin at different speeds by a limited amount (typically this is a percentage difference) which is when the differential locks and both wheels get power. This is not how locked differentials work such as in off-road trucks which supply equal torque and rotational speed to both rear wheels at the same time, which can cause issues with handling.
Features:
An industry first, 30-day Feel the Torque™ money back guarantee and a Limited-Lifetime Warranty!
Forged and Cryo-tempered
Advanced Shot Peening technology for increased surface hardness
Designed to withstand the extreme shock loads of competition-level drag racing
Maintenance-free gears eliminate the need for special fluid or rebuilds associated with typical plate LSDs.
Lock-free operation ensures no adverse steering response.
**As a break-in procedure, we recommend changing the fluid after the first 3-400 miles of use.**
Includes $500 core charge to be refunded when we receive your rebuildable core.
The best way to gain a prominent advantage over the competition is to do it with the MFactory Helical Limited Slip Differential. The smooth consistent distribution of power to the wheels with the MFactory Helical LSD puts the power-to-the-ground and maximizes your vehicle's traction. A must for any car be it street, strip, or track.
What exactly does an LSD do you ask? Without an LSD your car is actually 1 wheel drive, in that it can't supply torque to both wheels at the same time and will only supply torque to the wheel with less grip, which is what the shortfall is to an open differential (what most vehicles have).
An LSD only lets the wheels spin at different speeds by a limited amount (typically this is a percentage difference) which is when the differential locks and both wheels get power. This is not how locked differentials work such as in off-road trucks which supply equal torque and rotational speed to both rear wheels at the same time, which can cause issues with handling.
Features:
Industry first, 30-day Feel the Torque™ money back guarantee and a Limited-Lifetime Warranty!
Forged and Cryo-tempered
Advanced Shot Peening technology for increased surface hardness
Designed to withstand the extreme shock loads of competition-level drag racing
Maintenance-free gears eliminate the need for special fluid or rebuilds associated with typical plate LSDs.
Lock-free operation ensures no adverse steering response.
**As a break-in procedure, we recommend changing the fluid after the first 3-400 miles of use.**
Includes $500 core charge to be refunded when we receive your rebuildable core.
Unleash the full potential of your BMW and gain a competitive edge with the Turner Motorsport MFactory Metal Plate Limited Slip Differential. Engineered for superior performance, this differential ensures a smooth and consistent distribution of power to the wheels, maximizing traction and putting the power firmly on the ground. The 1.5-way design provides torque transfer during acceleration and halfway through deceleration, making it an ideal choice for those focused on track use.
Upgrade your BMW's drivetrain with the Turner Motorsport MFactory Metal Plate Limited Slip Differential for unmatched toughness and performance.
This is a complete differential to change the gearing of a manual transmission E90/E92 325i, 328i, or 330i (not for xi models) to a 3.64 ratio final drive. The standard gearing on the manual transmission cars is 3.15 or 3.23, making this E90 diff significantly shorter. This diff is from a 330i automatic where the gear ratio has to be shorter to make up for the transmission gearing differences and extra weight. This will dramatically improve acceleration on any 325i, 328i or 330i INSTANTLY! If you are looking for better off-the-line or rolling acceleration, and are willing to sacrifice a little top-speed (some of us don't get up to 150mph), this is one of the best ways to achieve it with almost no downside. There are few things that can improve your 0-to-60 and 0-to-100 times as much as shorter gearing, and this differential is clearly a best "bang-for-buck" solution for dramatically better acceleration. Since this is an Original BMW part it carries the same BMW two year warranty as any other new part. So there's no need to take a chance on a used part from a private seller. (former BMW part number 33107519944)
Changing gear ratio changes the RPM range for any given speed. Use the chart below for examples of speed vs RPM changes for the 3.64 diff.
2006 330i, 6-speed manual, stock 3.15 gears, 255/35-18" rear tires
Gear RatioGearSpeedRPM
40 MPH in 4th
3.154th40 MPH2,100 RPM
3.644th40 MPH2,400 RPM
70 MPH Cruise
3.156th70 MPH2,500 RPM
3.646th70 MPH2,900 RPM
5th Gear Speed @ 6,000 RPM
3.155th142 MPH6,000 RPM
3.645th123 MPH6,000 RPM
Why 5th? Because 6th does not have the mechanical advantage to get past wind resistance at these speeds - it is more of a cruise/overdrive gear. Using 5th for comparison purposes is much more relevant than having to take into account wind direction, resistance, grade, elevation, tire sizing, etc. These numbers are for comparisons among gear ratios only, not to determine what your E90 will top out at.2006-2011 325i or 328i, 6-speed manual, stock 3.23 gears, 255/35-18" rear tires
(click to expand)
Gear RatioGearSpeedRPM
40 MPH in 4th
3.234th40 MPH2,150 RPM
3.644th40 MPH2,400 RPM
70 MPH Cruise
3.236th70 MPH2,600 RPM
3.646th70 MPH2,900 RPM
5th Gear Speed @ 6,000 RPM
3.235th138 MPH6,000 RPM
3.645th123 MPH6,000 RPM
Speed in 5th gear at 6,000 RPM is for theoretical and comparison purposes only. It doesn't mean that these speeds are actually reachable.
A $100 refundable core charge must be added at the time of order. This core charge can be refunded when you ship your original diff back to us.
This item fits the following BMWs with manual transmission only:
2006-2011 E90 BMW 325i 328i 330i - Sedan
2006-2012 E91 BMW 325i 328i - Wagon
2007-2013 E92 BMW 328i - Coupe
2007-2013 E93 BMW 328i - Convertible