Seems like you'd get a better return on time/investment working on custom suspension parts for the rear end and getting it more dialed. 10.5 cars go a hell of a lot faster then any e46's and do on less tire then some of the e46's run with way more power.
Just 4 link the rear end and tub the **** out of it if you're serious about going fast, it will be a lot less costly then converting to AWD.
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Last edited by Doulos; 11-26-2012 at 11:28 AM.