The BMW M Variable viscous diff uses plates and heavy fluid to transfer torque between axles. Our clutch options are generally not for street use except in highly-modified cars that need the extra traction. Lower values equal a more aggressive lock-up. Custom ramp angles are machined into the carrier to dictate lockup behavior under acceleration and deceleration (coast). These diffs feature multiple clutch and spring discs - more clutches equal greater capacity for torque and heat management. Our clutch options are designed around serious track or race use since they can be easily customized around car setup and driving style. ![]() ![]() Some street 2 and 3-disc street clutch options have been discontinued due to the dwindling supply of original BMW cores. The only downside is potentially higher gear whine (but not in all cases). ![]() Lock-up is quicker and smoother and it's less affected by heat than a clutch. Torque transfer happens instantly and it doesn't need to sense a spinning wheel first. ![]() Helical diffs offer advantages in wear resistance and performance over traditional clutches. For purely street use we would recommend a helical such as Wavetrac or the in-house Diffsonline carrier. There are a number of limited-slip carrier upgrades for the E46 M3 but they fall into two groups - clutch and helical.
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