I am looking for comparative reviews of progressive rate coil springs for the E30. Particularly, does anyone know of reviews of H&R vs. Eibach vs. BavAuto (vs. other) progressive rate coil springs or have direct comparative experience themselves? As of last week, the torrid 12 year relationship I've had with my 1987 325i convertible is no longer monogamous: I bought my second BMW; a 1991 318i. The surprise is that the 318i has a small case Limited-Slip Differential; totally unsurprising is that its suspension is loose just about everywhere. I am going to renovate the suspension as a DIY winter project (springs, shocks, sway bars, control arms, tie-rods). I want to set it up to be 90% daily driver, 8% autocross competitor and 2% track rat. Said another way; I don't want to be miserable for the 90% of the time I'm not at 10/10s, but I do want a good autocross set-up. I've been researching spring choices. Quite frankly, I've confused myself. Which springs are best for my configuration goal? Why do I want to change springs anyway? I've got Bilstein HDs and Eibach 20/16mm adjustable sway bars on my 1987 325ic with stock springs and, quite frankly, seem to do okay in autocross (I'm in 6th place in C class with Golden Gate Chapter). Likewise, the long stock springs swallow the freeway bumps. I don't know what new shorter springs will do for me. I would prefer comments from people with actual comparative experience of the various spring options since ride quality is such a subjective issue.