It would mainly benifit lsd's because of the heat they generate internally, but it would also help out with higher ratio diff's because the input shaft spins that much faster than their lower geared counterparts. That being said it would really help out during aggressive driving (autoX, track days or just a few hours of canyon carving). It would also help prolong the life of your oil by preventing it from overheating, not that it's a huge concern for the e46. Plus it looks really nice installed lol.
Tinker Engineering - 2014
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