For Sale: Dinan ECU chip for 89-91 325i (i, is, ic, ix). Stock bosch ecu must be # 0-261-200-173 Save Big: $150 delivered to your door, with all instructions, dyno curves etc. I removed chip before selling car. Bought an M3. It makes a difference so try it out. Please email interest to bob.tatterson@domain.elided. Bob T. 1990 E30 M3 1988 E30 M3 track car in my sights- need to convince my wife!