I've had good luck with EBC Redstuff in the past. Just to make sure, are these the correct pads for front and rear on a 135i? I have the sport package if that matters.
http://www.amazon.com/EBC-Brakes-DP3.../dp/B0027ZZRGI
http://www.amazon.com/EBC-Brakes-DP3...xgy_263_text_y