Jaguar will not try to match the Mercedes' AMG or the BMW M performance models with its R designation models which trail the German models, which are climbing up and over the 500-hp mark, The Car Connection (TCC) website reported. "I don't think we're going to join the Germanic power struggle," TCC cited David Scholes, director of the X350 program which developed the new aluminium-bodied XJ saloon, as saying. Scholes told TCC that, with a 390-hp supercharged V-8, the R version of the flagship sedan will manage 0-60 mph times of 5.0 seconds.