Porsche 911 (993): Carrera, Carrera 4 and turbocharged models. Model years 1994 to 1998 (The Essential Buyer's Guide): Streather, Adrian: 9781787116603: Amazon.com: Books
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Porsche 993 - Wikipedia
Porsche 964, 993 & 996 Data Plate Code Breaker: Discover Your 911's Original Build Specification: Streather, Adrian Dr: 9781845841959: Amazon.com: Books