XYZ Racing Pro Rally Coilovers — Audi S4 B6 4WD 2003-2004

The Audi S4 B6’s quattro all-wheel-drive layout is a rare thing on a 2003-2004 saloon – full-time power to all four corners, built into the chassis rather than bolted on after the fact. That’s the reason this generation keeps surfacing on rally entry lists two decades after it left the factory floor, and it’s exactly the platform XYZ Racing’s Pro Rally coilover was designed to sit under.

This isn’t a fast-road or track-day spec. The Pro Rally kit is aimed squarely at top-flight rally competition, where suspension travel, ground clearance and the ability to shrug off repeated hard landings on loose surfaces matter more than outright cornering stiffness on tarmac.

What this coilover does for your 2003-2004 Audi S4 B6 4WD

Fit the Pro Rally coilover to the B6 S4 and the car gains the wheel travel and damping range that gravel and snow stages actually demand – the standard suspension simply wasn’t built to survive repeated compression events at speed on broken surfaces. Ride height becomes adjustable independent of spring preload, so you can raise the car for clearance over ruts and rocks without changing the spring rate you’ve settled on for the stage. The extra travel also keeps all four contact patches loaded through quattro’s power delivery, rather than letting one corner top out and cut traction mid-corner. For a 4WD platform that already puts torque down well, that consistency under compression is what actually turns grip into forward motion on loose ground.

About the Pro Rally coilover

XYZ Racing built the Pro Rally range specifically around gravel and snow-stage use, and the engineering brief behind it draws a hard line between two very different levels of rally suspension. One approach bolts a rally-spec coilover straight onto the factory chassis mounting points – a genuinely capable amateur-level setup, but constrained by whatever geometry the road car shipped with. The Pro Rally kit sits in the other camp: a professional-grade unit designed to go in once the car’s body has already been modified for competition, so the suspension geometry, mounting points and travel aren’t limited by what Audi built for road use. That distinction matters on the B6 S4, where the factory subframe and quattro driveline weren’t specified with rally-stage loads in mind. Expect a unit built for extended, repeated hard use rather than a single event, with the adjustment range and construction to match a car that’s been properly prepared for the stage rather than lightly modified for a track day.

Fitment for the Audi S4 B6 (2003-2004)

This kit is built specifically for the Audi S4 B6 4WD, chassis code AU17-1, covering the 2003 and 2004 model years. It’s matched to the quattro-equipped B6 platform rather than a generic Audi A4/S4 fitment, so confirm your car carries the AU17-1 chassis code before ordering.

What buyers also search for

• Audi S4 B6 4WD rally coilover kit for gravel and snow stages.
• Audi S4 B6 Pro Rally suspension built for a competition-prepped chassis, not road use.
• Audi S4 B6 4WD coilover travel and ride height adjustment for loose-surface events.
• Quattro rally coilover setup that keeps all four corners loaded under hard compression.

Confirm your AU17-1 chassis code against your logbook, then configure your Pro Rally spec for the Audi S4 B6 below.