[Richbot]

It's probably comparable in price to the M5 caliper, and that's $1100 per side from ECS, but their front and rear M5 caliper retrofit kit for the E9x is only $3800 which isn't totally outrageous though it doesn't include calipers (which you can buy and bolt on separately)

But I don't know why one wouldn't just buy the AP Racing kit at that price either, and shed weight from the car and get better performing parts and easier pad changes and and and

But I don't hard park so maybe the M stickers are important