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OEM Calipers Aftermarket Calipers Select By Piston Sizes
Advantage of a thin wall cut stainless steel piston like RB's vs. straight cut in weight saving.
Lighter wt means quicker brake response in braking and release.

RB Stainless steel pistons (Brembo Caliper Compatible) 30x32mm

OE Stainless steel pistons (Audi S5 B9 by Akebono) 30x31mm