Wavetrac ATB LSD Limited Slip Differential - BMW M3 E46 / E92, M5 E60, M6 E63

QT Parts is a Finnish online store.

Our warehouse is located in Nokia, Finland.

You can collect your order directly from us if needed. Simply select “Pickup” at checkout.

Pay securely with multiple payment methods, including invoice and installment plans through Klarna.

The delivery time for products in stock is 1-5 business days. We ship worldwide.

If the product is not in stock and it is a pre order product, the average delivery time is 5-21 business days. If the product has a longer delivery time than previously announced, we will be in touch. International orders may be subject to VAT, import duties, and customs fees upon arrival in the destination country.

Terms for product returns:

• You must return the ordered products within 14 days of receiving
• The products must be unused and without damages
• Commission fee for handling returns is 21,90€
• For product returns, the customer is in charge of the return costs. Only door to door service (Express)
• Shipping costs are not refunded

For international orders sales are final and non-refundable. Once an order is placed, it cannot be canceled or returned. By placing an order, you acknowledge and agree to these terms.

Return address: QT Parts, Vasarakatu 8B, 37150 Nokia, Finland.

Pre order / made-to-order products

If the product you have ordered is a pre order or made-to-order item, it is not subject to the 14-day right of withdrawal or return under consumer protection laws, as the product is manufactured or sourced specifically based on the customer’s individual order.

If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

Wavetrac Limited Slip Differential for BMW M3 E46 / E92, M5 E60, M6 E63
(NEW: uses original output shafts / flanges)

Simply put, Wavetrac is the only gear-based limited-slip differential (LSD) on the market that doesn't lose traction when one drive axle becomes unloaded or loses load. Such situations occur, for example, in aggressive driving, on track corners, over uneven surfaces, or on extremely slippery surfaces – more often than many might think.

Traditional gear-type LSDs (OEM, Quaife, Torsen, etc.) require load on both axles to function correctly. For example, when the inner wheel unloads over a curb on the track, power is not efficiently transferred to the outer, better-gripping wheel. The result is uneven power delivery and interruptions in power precisely when it's needed most.

Wavetrac solves this problem with its patented cam mechanism, which creates the necessary internal load even when one axle unloads. This allows power to still be directed to the gripping wheel, improving traction continuity, drivability, and overall speed, especially in corners.

Key Features and Benefits

• No loss of traction when axle unloads
  Patented design ensures continuous traction even in challenging situations.
• Carbon fiber bias plates (patented)
  Consistent performance throughout its lifespan – no power degradation due to friction changes as with traditional solutions.
• Wave Profile Technology (patented)
  Eliminates traction problems caused by near-zero load, which are typical for other ATB-type differentials.
• ARP bolts throughout
  Maximum reliability and durability in demanding use.
• 9310 steel gears
  Mounted in machined or forged steel cases – extremely high strength.
• Designed and manufactured in the USA

Driving Experience: "Smooth is Fast"

Wavetrac is specifically designed for high-performance street cars that are also used on the track. It operates unnoticed in normal driving and is fully compatible with stability and traction control systems.

On the track and in sporty driving, it provides continuous traction to both wheels without the understeer or "push" caused by traditional plate-type differentials. The result is more predictable behavior and better control.

One of Wavetrac's most significant advantages is its smooth and controlled power transfer at the limit of grip. When driving at the limit in a corner or adjusting the car's line with the throttle, Wavetrac provides a soft and predictable response – precisely when it matters most.