Audi RS4 is a high-performance version of the Audi A4, a compact executive car produced by German automaker Audi. It slots above the Audi S4 as the fastest model in the A4 range. Power came from a modified version of the B5 S4's 2.7 L, twin-turbocharged V6 engine tuned by Cosworth Technology, featuring enlarged intake/exhaust ports on the cylinder heads, turbochargers and intercoolers, new induction and exhaust systems and a re-calibrated engine management system; a six-speed manual transmission and Audi's Quattro all wheel drive system were part of the package.

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