Hi Hipertech,
I really enjoy the M3 bits and pieces. I think for those who've tracked their cars or really push it in the canyons, you'll notice the difference in the links. But for those who push mostly in a straight line or don't really push the car, you won't be able to feel the difference.
I gave my car to a friend to drive, he's got a 330 with the sport package ... he said it felt nice, but said he didn't really feel that much of a difference between our cars. I almost kicked him in the nuts ... to me, its a huge difference.
The Koni FSD are not a like a double adjustable, external reservoir'd coilover, but they are a fantastic street setup with the stock sport springs.
Junk
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11.535@124.423mph (1.641 60') - AutoTune 7-27, Race+Meth, Best ET w/ only 80% throttle 1st and 2nd
11.647@121.356mph (1.590 60') - AutoTune (beta pre-5-15), Race Gas, No METH
Perf Mods: Vishnu PROcede Rev3 v5, Vishnu PWM Meth Kit, AR Design DPs, AE Exhaust, Helix FMIC, Vishnu DCI, Forge DV, WaveTrac LSD (Best Trap - 124.665mph)