Originally Posted by Auraraptor
The ONLY rear upgrade that exists for our cars (and retains Parking brake functionality) is upgrading the to the 35iS/Euro 35i rears.
They are 320mm rear disks vs 300 factory on your car.
Yup, I was hoping someone would have a better answer than the one I already had...
I did find these folks, who can drill/slot a new set 320 rotors to match, as well as Zinc plating them to match the front rotors, and a set of new calipers/carriers powder coated to match the front BMW Performance Calipers. A bit more cash outlay, but both the braking performance and the looks will be enhanced. Wrote to them asking for a quote, but haven't heard back yet...