What is it?
Just in case an artificial 155mph limit was insufficient to float your boat, Jaguar has introduced a Speed Pack for its range-topping XJ Supersport which cranks up the still-restricted top end to 174mph.
With a superabundant 510bhp already available from the familiar 5.0-litre supercharged V8 engine, no modifications are required to hit the new limiter, although the tyre pressure sensors and virtual instrument display have been reprogrammed to handle the bigger number.
The body, however, does get some minor tweaks to help with the aerodynamic demands of going 19mph faster. At the front there’s a splitter beneath the bumper that directs air beneath the car to reduce lift, and to the back the bootlid has gained a more pronounced lip spoiler.
Cosmetically, the Speed Pack car is differentiated by a black mesh grille, red brake callipers and a new 20-inch alloy wheel design. These additions are also bundled into a Sport Pack which is now avaliable across the XJ range, and includes a greater range of interior options.
What’s it like?
A guilty pleasure. Adding the Speed Pack to the XJ Supersport LWB clocks up a £97,495 sticker. That’s a serious outlay for a car whose distinguishing party trick can only be legally flaunted on derestricted stretches of the autobahn.