I put a spacer in the rear to widen the track for straight line braking stability. I put a spacer on the front for handling. Pushing the fronts out makes the car rotate more/reduces understeer. On shorter tracks, slower tracks, I remove the rear spacers.
Of course widening the rear reduces the effect you get when you widen the front. Everything is a trade off...
I learned of this from James Clay of Bimmerworld.
I am contemplating a new set of wheels, going from a 8" to 8.5 (fronts), with an ET of 35 all around. This will push the front wheel out 13mm from stock.
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