Congrats on the OSG and AST setup with M3 bits. *sigh*
I want the same thing for my e90. Got the Quaife from Harold back in the day when it was the only game in town (pre-Wavetrac) and OSG was soooo expensive...as I recall.
I was in a hurry to install a real diff that met my needs at the time, while reducing the wear and tear of the brakes induced by the nanny controls that passed as e-diffs for our rides.
Looking at the 400/800 Swift Spring setup with the AST singles, though... currently have 219M wheels and the potholes are not as severe in the Mid-Atlantic...
Can't wait to read your review/impressions once you put on your new toys!
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BMWCCA Member # 414198 |E90|SGM|6MT|Premium|Cold|Sport|Tint|LCI MSport Conversion|MTech|Blacklines|219M|PSS|Quaife|Helix FMIC|M3 Suspension|Megan Racing|GC Camber Plates/Coilovers|Eibach 440/800#|AR Catted DP|Cobb AP|StopTech Drilled/Slotted|SS Brake Lines|DWS
Quaife Review: http://www.e90post.com/forums/showthread.php?t=311570
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