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Reckon without valving specs of STD Sachs, Koni red, of Bilstein 6 or 8 its all a bit guessy.
But then it all gets a bit complex also.
Why do you think aftermarket is better than BMW specified that a whole team of engineers settled on? Sachs is a major manufacture no different to Michelin for example.
I found M sport shocks and springs, with 19" rft tyres rides harsh, unforgiving, and noisy. I went to 45 walls on 17" with standard tyres and the car still handles like on rails, is quiet, an comfortable like you would hope a luxury sports car would be. It appears, to me anyway, that OE m sport suspension does work in a way that's not obvious with 19 rft. Given we don't have smooth roads around hear the standard tyres feel like they work with the suspension better to deal with the road rather than dealing with chatter from a system with no give.
I know its not what your asking, but just an observation.
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