I also felt that swapping to Koni shocks in the rear made the car feel better to drive -- the stock rear shocks didn't have much low speed rebound, so the trunk would feel like it was floating if I went over crests. The Konis fixed that.
I got Koni Yellows. Adjustable dampening and they don't rattle/clunk like the Billstein B6's apparently do.
Konis are amazing, I won't ever run anything else.
I have a set of the adjustable yellow sports using the stock springs. Firm but not harsh, I run them around halfway between soft and hard. One of the best upgrades I've done.
I’m quite partial to koni struts/shocks. You can adjust the rebound rate to make them softer for your commute but stiffen them up when you get to hit those mountain roads
Plus they work on stock springs if you’re like me and like the car not bottoming out
After almost two months and driving 4000 kilometers on varying quality mountain roads, I think I made a good decision when opting for the Koni Special Actives for my 2006 Mazda3. I expected them to be a bit softer, as they are stiffer than the Koni FSD. They are not uncomfortably stiff, shielding people inside the car from harsh roads and speed bumps. The car feels really stable. Summarizing my impressions so far: reduced high frequency noises and jolts, reduced body roll and pitch, increased stability, the car feels more composed even in extreme situations, and feels more premium. The faster I go on bad roads, the smoother it feels.
I did koni inserts with epic engineering springs on my saabauri before I converted to sti suspension and ohlins fp struts. The konis felt great.
You will probably find what you're after just entirely from upgrading shock absorbers. There are stock height options from Koni and Bilstein at least (and plenty of others, I haven't dug too far into it). It will improve the ride as a lot of the poor ride quality standard is in the shock absorbers and how they're set up, not the spring rate being too soft.
Koni Yellow + Eibach springs of some rating that I have long forgotten...
I had koni yellows on my CRX. Replaced them with coilovers and regretted it.
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