XYZ Racing Tarmac Rally Coilovers — Cadillac CTS II (Cancellation Kit for Electronic Damping) 2008-2014

The CTS II is a heavy, long-wheelbase American sports saloon that GM sold with Magnetic Ride Control as a comfort-first damping system – excellent on smooth motorway, hopeless once you start loading it into a stage corner with broken sealed surface underneath. The factory MRC dampers also throw fault codes the moment you try to substitute a passive coilover without addressing the wiring. This XYZ Racing Tarmac Rally kit for the CA02-C chassis solves both problems at once: a passive, fully-adjustable damper built for sealed-stage rally use, supplied with the cancellation harness that keeps the dash quiet.

For a 1.8-tonne rear-drive saloon being driven hard on patched tarmac, the brief is specific. You need a damper that copes with mid-corner compressions over crests and ruts without bottoming, that recovers between hits, and that keeps the rear axle planted when the LSD is loading up out of a slow corner. That is exactly the use-case this Tarmac Rally spec was developed against.

What this coilover does for your 2008-2014 Cadillac CTS II (Cancellation Kit for Electronic Damping)

The Tarmac Rally damping curve is built to absorb sharp vertical inputs – the kind of hit you take across a broken kerb edge or a sunken drain on a closed-road stage – without transmitting the shock through to the chassis. On a CTS that weighs the better part of two tonnes, that translates to a car that no longer skips sideways over mid-corner bumps. Suppressing body shock keeps the contact patch loaded for longer, which means the rear tyres hook up on corner exit instead of spinning into the LSD. Ride height is adjustable so you can set a usable rake for stages without hammering the splitter on transit. And because the cancellation harness disables the MRC fault logic at the ECU level, you can swap to passive dampers without the instrument cluster flashing service messages every time you turn the key.

About the Tarmac Rally coilover

This is a damper engineered specifically for sealed-stage tarmac rally, not a re-badged circuit kit. The valving is set to absorb the impact of uneven pavement – the sort of compression you take when crossing a big bump at speed – and then control the rebound so the body settles quickly rather than oscillating. XYZ describe the priority as suppressing shock through the body and increasing tyre traction across imperfect surfaces, which is the right priority for this discipline. All the damping settings on this kit come out of XYZ Racing’s own Tarmac Rally programme, so the base specification is already in the working window for the use-case. Construction is a fully-adjustable coilover with ride-height adjustment independent of spring preload, which lets you drop the car for stages without sacrificing usable travel.

Fitment for the Cadillac CTS II (Years 2008-2014)

Built for the CA02-C chassis CTS II saloon, 2008 to 2014 model years. This specific kit includes the cancellation harness required to disable the factory Magnetic Ride Control electronic damping system – if your car came with MRC from the factory, this is the version you want.

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Configure your Tarmac Rally spec for the CTS II below – spring rates, ride-height range and damper settings are all set out in the configurator.