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Originally Posted by webcrawler
The S4 Engine - 20v 5 valve comes standard in:
1990-1991 - Audi 90 Quattro / Audi Coupe Quattro
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Not so. The UrS4/S6 engine is a 2.2L 20v 5cyl turbo (AAN engine code). The motor in the Audi 90 and Coupe Quattro is a 7A code non-turbo motor. The '91 Audi 200 came with a early variant of the UrS4/S6 engine, known as the 3b. They are a little cheaper, but hard to find nevertheless.
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