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More data.... Most of the 410/390 conversions from PCCB to iron/steel rotors are designed to be used on the GT series (997/991/992). Nobody has ever heard of a 410mm iron rotor for a Cayenne (it's all about getting the brake hub/hat correct).
Apparently Brembo makes a 405mmx34mm iron rotor that fits a Cayenne Turbo. They also have a 412mmx38mm iron rotor that supposedly fits a Cayenne Turbo. Waiting to hear back from Brembo to see if either of these two solutions would work to replace the original 410mmx36mm ceramic discs on a Cayenne. Then it's onto finding replacements for the rears which are also "oddly/uniquely" sized...
The head tech at the Porsche dealership (USA) said it would "more than a pain in the a$$" to switch spindles/mounts/calipers/etc. so your comment above makes perfect sense.
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Now: 2013 Cayenne GTS
Ex: 1999 C2, 2004 Cayenne Turbo, 2002 C4S, 1999 BMW M Z3 Coupe, 2013 Audi RS5
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