Wavetrac limited-slip rear differential in the shop 335i, and it really changes the way the car drives. By no means does it eliminate tire spin or slip -- it can't perform miracles -- but when the rear end does give way, both wheels are spinning, not just one. Those annoying one-wheel burnouts, which seemed to happen every time I drove the car, have been replaced my much-less-frequent small episodes of rear-end-hip wiggling as the tires struggle a little before hooking up together. Another benefit is the elimination of the strange left-right-left jerkiness that was the result of the stock "e-diff" braking action attempting to get control of the one-wheel tire spinning.
By now we're getting pretty good at the differential swaps on these cars. Give us a call and we can put one in for you. It takes about a day.
Note that there are two types of differentials on these cars. Most of the automatic-equipped cars have bolt-in differentials, and some of the early manual-transmission cars do, too. Replacing the differential on those cars is a straightforward affair. Other cars have weld-in diffs, and that requires a bit more work and cost, since we have to have ring gear machined off the old differential.
In my next post, I'll talk about a CP-E front-mounted intercooler upgrade. Check back in a few days.