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I did the same upgrade with M3 arms and PS kit. The front sway that comes with PS kit is the same as E93 M-sport. In my case the entire contents of PS kit and springs were installed. Its a very good upgrade in terms of suspension stiffness. Its a bit firmer than I was expecting, but since the handling is so much improved I'm really pleased I had it done. On most decent roads you hardly notice any loss in ride quality, but on bad roads you certainly will notice that its less compliant. At least the car feels connected to the road, more like a sports car now, which it didn't before IMHO. The rear of the car feels much better controlled than before. The turn-in crispness has been totally transformed from stock. M3 arms and PS seem to compliment each other very well. I think this is a great upgrade for the 135i.
Last edited by John_01; 07-06-2012 at 06:47 AM..
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