Look at Ebay for 135i brakes or calipers. Used will save you money, I've seen grey 135i take off parts for less than 1.5k. The performance pads I believe share the same number as stock 135i pads. The rotors are the only difference.
I would also call local dealerships and ask if they "upgraded/updated" any of their lot 135i cars to BMP brakes, they might have the gently used stock 135i brakes.
Also, understand that the kit will add weight to the car, and many 128i guys think its just bling since the 135i brakes have let people down on the track(the pistons & dustboots crumbled under extreme heat, needing rebuilds using better parts).
128i Sport 6MT converted to Euro 130i spec, tuned by evolve ~220 whp 207 wtq(ft-lb) SAE
In-progress: e46 m3 trans mnt, e36M lip Wishlist: m3 susp, n55 eng mnt, headers, LSD, finn dif e60
"The 1-series is the last car that BMW engineered before the Germans, as a car-making culture, fell out of love with driving." - R&T 2013 135is
Last edited by andrey_gta; 03-24-2013 at 08:35 AM.