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BMW makes their M cars for a "sporty" feel, perhaps some models more than others. This is very different from a track set-up, which some folks are after (myself included).
I don't think you need to be an automotive engineer to change parts. For suspension mods, in particular, having lots of experience with the parts you are installing and how they should be set up is an excellent idea. This is likely a mechanic or a race prep shop.
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