 The basic substructure of the XF has been carried over from the preceding S-Type, although the body has been stretched to meet crash safety requirements, and heightened to provide additional headroom while still retaining the "saloon within a coupé" proportions.The suspension and mountings are the same as that used on the XK, while the engine line-up is basically similar to that used in the S-Type.Sound and vibration insulation is provided by the addition of a special underbody tray and engine mounts, a tuned exhaust system, and a double bulkhead between the engine bay and passenger compartment.