I installed H&R sport springs on my 335i Sport Line. It is a bit lower than I thought it would be. On smooth to lightly bumpy roads, the ride quality is pretty smooth. But get a little more rough and ride quality suffers a little bit. The struts bottom out on moderate dips and bumps. Usually to me, this is not acceptable. However, the look makes it worth it for now. As soon as the struts wear out, I am definitely upgrading.
Going from a Luxury Line to H&R springs will be drastically different. However, it might not be too bad with a 328i. The front sits higher due to the lighter engine.
Hope this helps.
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