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Thanks all - sorry for the delay in responding. Price wise, M-Factory LSD is cheapest; bimmer world sells the wavetrac and clutch style (2 and 3) through diffsonline. Wavetrac is still a good bit less expensive than the clutch style and is basically maint free. While there is a lot of info on the Wavetrac, it's tough to say how well it will do on track.
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