First of all, I'd like to thank Harold of HP Autowerks (
http://www.hpautowerks.com/) and Vincent and Sean at EuroRev (
http://www.eurorev.com/).
When no one else had the M3 sways since they were in back order, Harold got me the sways last Friday, which I got Saturday. I just had them installed by EuroRev. Sean was very professional and friendly. Vincent, the main guy at EuroRev, gave me a great pricing of the installation.
Sean knew exactly what to do with the installation, so it went very smoothly. I was out from the shop in no time.
I definitely feel the flatter-ness when I corner now. The tiny and thin rear sways definitely needs to be replaced. The rear one is now 23 mm, compared to low 10s of the original one.
The front one was about the same size, or at least it seems that way. However, the overall shape was a bit different, comparing my original one and M3 one.
The parts were about $430 shipped (tax since I am in Cali), and $120 for the sway installation. For $550 total money spent, I think this is such a great suspension upgrade for those that are tight in budget.
Thank you, everyone, for sharing your great information and knowledge. I read and did much research before I dove into this mod, and I think I made a right choice.