[Fredo]

I refreshed the suspension on my F30 2012 335i Sport Line at 87k miles. I went with Koni FSD (Frequency Selective Damping). These are the parts installed:

31126855743 Thrust Rod Bush, F30 2.0 @ 64.19 =$ 128.38
31336787114 Low Spring Pad, F30 2.0 @ 9.03 =$ 18.06
31306868240 Strut Mnt Gskt, F30 2.0 @ 11.35 =$ 22.70
SHOCK KIT Koni FSD 1.0 @ 550.00 =$ 550.00
33506866038 Shock Mnt Gskt 2.0 @ 7.06 =$ 14.12
33536855439 Bump Stop, F30, Rear 2.0 @ 25.07 =$ 50.14
31306880438 Strut Mount, F30 2.0 @ 186.96 =$ 373.92
33506862725 Rear Shock Mount 2.0 @ 109.99 =$ 219.98
31336857729 Bump Stop, Frt 2.0 @ 27.99 =$ 55.98
31306863134 Strut Mount Bolt 6.0 @ 3.99 =$ 23.94
31306792211 Sway Bar Link, Frt 2.0 @ 63.99 =$ 127.98
31306791712 Up Spring Pad, F30 2.0 @ 12.74 =$ 25.48

*** Total in parts = $1,610.68 + tax
*** Koni FSD has been replaced with Koni SA (Special Active)

I didn't replace the stock springs. I considered the BMW Performance suspension kit (#33-50-2-320-981) which requires to replace the coil springs but decided against it. My main reasons : this car is my DD, I don't track it, and I didn't want to lower it. Koni FSD specifically requires to keep the stock springs.

My car has the option "S2VFA Adaptive M suspension" also known as EDC (Electronic Damper Control). Koni FSD is a non-EDC set and it required coding to remove the EDC out of the car. My mechanic coordinated with Joe @ TopGearSolutions for this. You may know TopGear is a sponsor on the bimmerpost forums with good reviews. I was told next time I visit the dealer, they may update the software on my car and this would require coding to remove the EDC again.

I'm very happy with the results. The clunking noises are gone. If I could use one word to describe how the car feels, it would be "luxury". The ride is not harsh at all. The car feels smooth on the road but it doesn't feel floaty. My wife drove the car afterwards and she didn't complain at all. I believe Koni FSD is one step above the factory setup. But I bought my car with 76k miles so I can't tell for sure.

So far I drove 300 miles after the install, I will update again in the future.