The XKR, which was introduced in May 1998, used a supercharged variant of the V8 engine used in the XK8 which is also shared with the XJR albeit with a few air-to-water intercooler modifications and a two piece drive shaft. The supercharger is a 1.8 L (112 cu in) Eaton unit shared with the Ford F-150 SVT Lightning pickup. The supercharger spins at 1.9 times the engine’s speed and has 11.9 pounds of boost pressure. Other visual differences from the XK8 include a small rear spoiler and bonnet louvres on the bonnet for improved engine airflow along with a meshed front grille. 

From 1998 onwards, all models of the XK lineup were fitted with the Servotronic II power steering. From late 1999, an optional R kit became available for the XKR which included a stiffer suspension system and gold coloured wheels. Since at least 2000, a GPS system was available as an option on all XK models which replaced the three gauges on the centre console.

price $	$ $81 800 usd
engine	Supercharged V8
valvetrain	DOHC 4 Valves / Cyl
displacement	3996 cc / 243.9 in³
bore	86.0 mm / 3.39 in
stroke	86.0 mm / 3.39 in
compression	9.0:1
power	275.9 kw / 370.0 bhp @ 6150 rpm
specific output	92.59 bhp per litre
bhp/weight	bhp per tonne
torque	524.7 nm / 387.0 ft lbs @ 3600 rpm
redline	6200 rpm
body / frame	Unit Steel
driven wheels	Front Engine / RWD
front tires	F 245/45ZR-18
rear tires	R 255/45ZR-18
front brakes	Vented Discs w/ Vacuum Assist & ABS
f brake size	x 325 mm / x 12.8 in
rear brakes	Vented Discs w/ Vacuum Assist & ABS
r brake size	x 307 mm / x 12.1 in
front wheels	F 45.7 x 40.6 cm / 18.0 x 16.0 in
rear wheels	R 45.7 x 45.7 cm / 18.0 x 18.0 in
steering	Rack & Pinion w/ Power Assist
wheelbase	2588 mm / 101.9 in
front track	1504 mm / 59.2 in
rear track	1499 mm / 59.0 in
length	4760 mm / 187.4 in
width	1829 mm / 72.0 in
transmission	5-Speed Auto