For sale is the Brembo 4 pot 348x36m caliper that is from the 5/7 series, but is the same caliper as the M340 caliper, but it does not have the blue paint.
Great option if your 3 series didn't come with the MSport kit and you want to upgrade to the same calipers up front. Would just need to add the 348mm rotors and these calipers and you're good to go.
Calipers and pads have around 10,000 miles.
Asking $250 plus shipping form Portland, OR (97229). Way cheaper than most of the M340 blue calipers that I've seen. Same caliper, just no paint.
Includes calipers, pads, pins, anti-rattle springs, and bolts.