The XJR (X306 series) was introduced as a high-performance sports model of the X300 series and was Jaguar's first supercharged road car. The power of the AJ16 six-cylinder engine was increased to 326hp using an Eaton M90 supercharger and an air / water intercooler. The XJR featured wider 17 "wheels, compared to 16" in the rest of the X300 range, Pirelli P-Zero tires, stiffer suspension and a sport differential. Although the Getrag manual transmission was standard, nearly all XJRs were built with the optional GM 4L80-E automatic transmission. The XJR X306 went out of production in 1997, with the arrival of the X308 series.