To the original poster, that posed the question: it is worth it to paint the stock calipers, so much better looking that dirt and rust! Doesn't matter that they are the stock ATE/Girling calipers, doesn't even matter how noticeable the paint will be depending on which wheels you have on, it gives the calipers a finished look. Brembo calipers are usually red, unless you are talking about some of the newest Ferrari's which have yellow painted Brembos. On my '03 325 xi which is black over black, black Beyern 17" Mesh wheels, blacked out grill and roundels, I have painted the stock calipers red, the non-braking surfaces of the cross-drilled rotors black and the calipers pop behind the wheels. This would be much to the distain of some of the members of this forum. On my '03 330xi sport, which is platinum silver, again, the non-braking surfaces of the cross-drilled rotors has been painted black and the calipers have been painted yellow with silver 17 inch wheels, blacked out grill and roundels black and silver. Again, this would be to the distain of many members of this forum. My point, OP, if you want to paint your stock calipers, do it! To hell with some of the opinions of members of the forum. Either red or yellow will look nice behind your black wheels. Just make sure that you clean your calipers well before painting and if using spray paint, you may want to give them several thin coats. My 2 cents worth, lets see how beat up I get over it, LOL.