Jaguar's new Speed Pack for the Jaguar XJ lifts top speed from 155mph to 174mph

Jaguar is offering two new performance packs for its flagship Jaguar XJ saloon, including a Speed Pack, which lifts the top speed of supercharged models from 155mph to 174mph. All XJs apart from the 503bhp 5.0-litre V8 can be equipped with a Sport Pack.

See pics of new performance Jaguar XJs

This ushers in aerodynamic upgrades that include a front spoiler, a larger rear spoiler, a gloss black finish for the front grille, new 20in five-spoke alloy wheels, red-painted brake calipers and new split twin tailpipes at the rear.

Read about Jaguar's latest hardcore Jaguar XKR-S cabrio model

Inside, there are Jaguar Performance front sports seats, piano black trim with carbonfibre highlights and a wider range of colour options.

Supercharged V8 models equipped with the Sport Pack can also have the Speed Pack to lift the electronically limited top speed. This is achievable because of the revised aero package and a recalibrated engine management system.

Other Speed Pack tweaks include reworked software for the digital instrument panel.

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