Dale,

     You might want to put this information somewhere. Believe me, It 
     took a lot of trial and error to determine what parts were 
     required, especially for the rear.
     
     Theo.
     
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     I just completed the 325-to-M3 brake conversion. I decided to 
     have a BMW service place to do it since it requires air tools 
     and (maybe) some specialized BMW tools. My car has the BMW Sport 
     suspension package and upgraded 17" forged BMW wheels.
     
     Changes Required
     ----------------
     
     Master Cylinder, ABS unit:
     No changes needed. The master cylinder part numbers are different 
     but a knowledgeable mechanic told me that they are almost 
     identical.
     
     Front Brakes:
     What you need is everything from the wheel bearings and out. The 
     added M3 parts fit on the existing 325 parts with no problem. You 
     need 17" wheels. You do not need to change any suspension parts.
     Hours to complete, ~2-3.
     
     Rear Brakes:
     This is where it requires much more M3 parts. You must change the 
     swing arms, half shafts and differential flanges in addition to 
     everything from the wheel bearings and out. You do not need to 
     change the differential or any suspension parts. Make sure you 
     have all the M3 bolts and locking plates for the diff flange as 
     they are different from the 325 ones (you guessed it, bigger). 
     Overal, the M3 hardware are much beefier and the bearings much 
     bigger. 
     Hours to complete, ~4-6.
     
     Misc:
     While you are at it, you might want to change your brake lines 
     with DOT approved SS/kevlar ones. Note that the stock 325 brake 
     lines fit. Also, flush your brake fluid and replace it with a 
     good quality one, like ATE Super Blue.
     
     Result:
     The pedal travel/feel is the same as stock. I had new Repco 
     Deluxe pads before and now and I can tell that the car stops much 
     faster now. I do not have to step on the brakes too much any 
     more. A much more confident feeling for the driver!
     
     I purchased all the 1995 M3 parts used for ~US$1200. 65% of the 
     cost is for the rear brakes... You can sell your 325 brakes and 
     offset the cost, a little. Some people change just the front 
     brakes but I could not stand looking at the solid, tiny, rear 
     brakes. Besides, with only the front upgraded the car felt like 
     the rear brakes were catching first. I did not like the feeling.
     
     Is the upgrade worth it? I would do it again. The M3 brakes, and 
     accompanying hardware, are much better than the standard 325/328 
     ones. This is a great safety upgrade.
     
     Theo.
     '95 325iC (in sunny S. California)