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Originally Posted by KL2DC
You'd be fine if you're ok with the costs of installing and removing the aftermarket springs. There are some concerns of the springs not matching the OEM shocks but at the worst you'd experience some added harshness/bounciness. The OEM shocks will wear a bit faster but nothing you'd have to worry about within the time period of your lease.
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From my experience...the added bounciness will be substantial. I tried to run H&R sports on my M3 with the OEM shocks...I lasted only a few months before I couldn't take it anymore. The car felt absolutely terrible over the smallest bumps and never felt planted to the road. I bought some Koni Yellows...the difference was night and day.
For the e46 M3, the Eibach Pro-Kits are supposed to be better matched with the OEM shocks. I assume they would also be better matched for the e90 OEM shocks as well. He might want to consider those instead.