If you want to tighten up the 1 series suspension I'd suggest a few important mods.
Stage 1: Better dampers and springs.
Stage 2: Upgrade rear sub-frame bushings + M3 front sway bar.
Ideally you should do it all at the same time. The dampers will improve the car a lot, but you will still have rear end instability and weird handling when you push the car. IMO, the stock rear subframe bushings are close to being unsafe in the 1 series. Also with the stock sub-frame bushings the car tends not to track completely straight, which was annoying to me. If cost wasn't an issue, I would say that every 1 series owner should get the sub frame bushings upgraded straight away.
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