Rear-engine, four-wheel drive layout
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In automotive design, an R4, or Rear-engine, Four-wheel drive layout places the engine at the rear of the vehicle and drives all four wheels. This layout is typically chosen to improve the traction or the handling of existing vehicle designs using the RR layout.[citation needed]
Notable vehicles with the R4 layout include several high-performance Porsche sports cars, including the 959, the 911 Turbo since the introduction of the turbocharged version of the 993 series in 1995, and the 911 Carrera 4 introduced with the 964 series in 1989.
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