- Rear-engine, four-wheel drive layout
automotive design, an R4, or Rear-engine, Four-wheel drivelayout 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.Fact|date=April 2008
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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