Originally Posted by katsbimmer
ksfrogman, so how do think the ride would be going from (non-ZSP) to H&R sport springs...glen
That's a challenging question for anyone to answer because the words we use to describe the "experience" define that which is subjective. To me, firm may be good. To someone else, firm may be a negative term.
I can only describe the difference based on my experience, likes and dislikes. I did not start with a non-ZSP car, but my friend "marcus" did. He went from non-sport 325i to Style 162 wheels with Eibach Pro Kit springs, to Maya STM wheels (19"), back to Style 162 wheels with H&R Sport springs, then added DPE wheels. He is very happy with his ride, though he noticed the H&R sports ride rougher than his Eibach Pro springs did.
Personally, from a looks standpoint, I feel the non-ZSP cars look like 4WD cars. Why are they so high? The large space between the top of your tire and the topmost portion of your wheel well arch may look good on a Chevy Tahoe or 3/4-ton pickup truck, but not on a sports sedan.
Back to your question, go to an E90 meet and drive someone's ZSP car, then find someone with the H&R sport springs. Feel the difference for yourself!
My 0.02, go for it! It will look a lot better, the ride will be more firm, but positive and sporty. You won't regret it.