XYZ Racing Circuit Master Coilovers — Jaguar XJ (X351) 6 CYL (Fr FORK) (OE FOR REAR AIR STRUT) 2010-2019

The X351 XJ’s air suspension was built for wafting, not for holding a line through a fast direction change – a big saloon riding on bags that prioritise ride comfort over body control. Swapping to the Circuit Master coilover on the front strut (retaining the OE-style rear air arrangement this kit is built around) gives the 6-cylinder XJ a front end that reacts to inputs instead of floating past them, without touching the rear’s factory air character.

This is the sustained-lap-time end of the XYZ Racing range, built for drivers who put the X351 through repeated hard sessions rather than the occasional back road blast. On a car this size and this heavy at the nose, front-end support under load is where lap time is won or lost, and that’s exactly what a coilover-based front strut is engineered to deliver.

What this coilover does for your 2010-2019 Jaguar XJ

Fitting the Circuit Master to the front strut gives you a fixed, adjustable spring-and-damper platform in place of the air spring’s variable ride height and softer damping curve, so front camber and caster stay consistent lap after session rather than drifting with load. The 9720-way damping adjustment (delivered through the kit’s 3 external knobs) means you can add compression support for trail-braking into a corner on a Tuesday track day, then back it off for the drive home, all without swapping parts. Because the big Jaguar saloon carries real weight over its front axle, a firmer, correctly-valved front spring rate cuts the dive under braking that air struts are prone to, sharpening turn-in on a car that was never originally set up to be pointed hard into an apex. Keeping the rear on its OE-style air arrangement means ride height and rear compliance stay as Jaguar intended, while all the handling gain is concentrated where the XJ actually needs it, at the front axle.

About the Circuit Master coilover

The Circuit Master sits at the top of the XYZ Racing line-up, built specifically around repeated circuit use rather than a single fast lap. It’s run by XYZ’s own racing teams on international circuits, and the damper carries 9720 individual adjustment combinations across its 3 external knobs, giving a genuinely fine window to tune compression and rebound rather than picking between a handful of preset stages. The knobs work through a small-oil-hole metering design; on rough sections you may hear a faint noise as oil passes through that restricted passage, this is normal and not a fault, and the valving is specifically engineered to shrug off track kerbs and bumps without drama. It’s positioned as the kit for owners chasing outright lap time and consistent behaviour session after session, rather than a once-a-year fast-road unit.

Fitment for the Jaguar XJ (X351) (2010-2019)

This kit is built for the Jaguar XJ, chassis code X351, 6-cylinder models produced from 2010 to 2019. It’s specified for the front strut (Fr FORK) position, engineered to work alongside the OE-style rear air strut arrangement rather than replacing it, so confirm your XJ is a 6-cylinder X351 within this build range before ordering.

What buyers also search for

• Jaguar XJ X351 front suspension upgrade to sharpen turn-in on track
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• Jaguar XJ X351 front strut replacement for air suspension on a 6-cylinder saloon
• Jaguar XJ coilover options that keep the rear air strut character intact
• Jaguar XJ X351 adjustable front damping for circuit and fast-road use

Get the front end of your X351 working the way the rest of the car deserves, configure yours below.