I have a Quaife and here's what I like about it:
-Proven technology. Been around for decades
-Quiet. No difference vs. stock in this regard
-No maintenance
Can't comment on the Wavetrac. But the Quaife - the dependability of these things is worth a lot.
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2024 BMW M3 Sedan Frozen Pure Grey II/Fjord Blue, 6MT
Past: 2021 Z4 M40i Frozen Grey II/Black Alcantara | 2017 F30 340i Mineral Gray/Coral Red, 6MT | 2011 E92 335i Le Mans Blue/Black, 6MT
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