This is the same rig I'm running on my 35i. I got the 6-pot Brembo BMW front brake kit from
Husker Auto Parts for $1,150 or so. I did front and rear
SS lines from UUC for $120 (they were correct). In the rear I put
Powerstop drilled and slotted rotors for $140, along with
EBC yellowstuff pads for $75, giving a bit more bite to round out the setup.
The whole setup works well. I have about 3k miles on it.
Filippo