Aftermarket yes if you want to call it that but some of us go with Brembo which is already making the OE parts for your car
Going from the stock calipers and rotors to the Brembo kit I didn't notice a huge improvement in braking. The OE braking system on the G12 is already great at least in the 750 models
The problem is they do not make any brackets for our rear brakes. Me and a buddy of mine had to 3D print a bracket to adapt the rear and while it works just fine we don't have the power or legalities to sell these and make more for other owners.
Here is what it looks like though
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