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1. Rear is the most difficult, you may want adjustable endlinks. For some reason mine also came with the wrong bushings rear, so I used a pair of modified powerflex bushings.
2. I started with middle, and now run the stiffest. It is still safe enough on my car, as the rear still has greater traction with stock alignment on the track. (Stiffer sway bar normally means less traction)
3. Alot (compared to non-m sport).
4. Absolutely (compared to non-m sport). It is much stiffer over bumbs etc.
My car uses non-m sport springs in combination with koni fsd and M arms/bushings front rear. It is still comfortable enough for longer road trips. The exprience may be different when comparing to m-sport sway bars in combination with m-sport springs.
I actually run the stiffest setting rear without adjustable endlinks. The bar touches the powerflex bushing on my differential (bushing problem). Otherwise no problems. I have posted pictures over at spo olstreet.
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