mine had the same marks:
this was with RA classic seals, but they didnt break, it just had leaking coolant seals. it had 60k miles on stock turbo 15 psi, 7's and 9's plugs
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1993 RX-7 Touring MB, stockport 13B-REW, 9.4CR rotors, T04S 60-1/p-trim single turbo
1986 RX-7 Base project track beast
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