Quote:
Originally Posted by M3SQRD
I absolutely would not want a 30yo caliper design with increased 25 mm thick pads if the caliper stiffness has not been maintained or, preferably, increased to accommodate a 25 mm thick pad. I’d also want to maintain a 36 mm thick rotor, not a thinner rotor to reduce the opened caliper width. Maintaining or increasing stiffness will come at the cost of additional mass. I have the AP Racing CP5555 caliper with 18 mm thick pads on my e46 M3 track car and I would not want that caliper widened without changes to its stiffness.
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The caliper has been stiffened, and it maintains 36mm thick rotors. Same rings as the 18mm kit but that's the only thing that is common between the 18mm and 25mm kits.