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Originally Posted by ChrisZang
993 = beautiful car
as far as I know the only Achilles heel are the issues with the secondary air injection, which can turn out to be very costly
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Yes, the SAI issue can happen. It may take $1k to repair (by cleaning, piano wire and solvents) or an entire top end overhaul for north of $10K. Can happen at <50k miles, while others have gone over 200k miles with no issues. Still, a very-very robust car and motor. If this is a concern, a potential owner can either buy a 1995 or a 96-98 with a fresh top-end.
A quality PPI (leakdown & compression) can also give assurances against this SAI issue. The issue will throw CEL codes.