XYZ Racing Street Advanced Coilovers — Audi S4 B6 4WD 2003-2004

The B6 S4’s quattro layout puts a twin-turbo V8 ahead of the front axle, and that mass sits heavy over the nose in every direction change. XYZ Racing’s Street Advanced coilover is built to manage that weight without turning the ride brittle on the road you actually drive every day.

This is the mid-tier setup in the XYZ range, sitting between a comfort-biased fast-road kit and the full track platform, so it is aimed squarely at owners who split their time between the daily commute and the odd track day rather than committing to one or the other.

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

With 720 damping adjusting ways on tap, you can wind the front end up to check the nose-heavy quattro platform under trail braking, then back it off again for the motorway run home. That range matters more on a B6 than on a lighter chassis, because the V8 and all-wheel-drive hardware add weight the front struts have to control on turn-in. Ride height adjustment lets you correct the factory sag that shows up on these cars once the original air or steel springs age out, and drop the centre of gravity without pushing the car into a harsh, jarring set-up. The result on the road is a car that turns in with less of the initial push through the nose that the standard S4 suspension allows, while keeping enough compliance in the damping to deal with UK B-roads rather than just a billiard-table circuit.

About the Street Advanced coilover

XYZ Racing developed the Street Advanced kit as the volume product in its range, refined over several years and put through testing at circuits used by racing teams internationally before it reached its current specification. It is built as a dual-purpose kit, equally at home doing normal road miles as it is on a track day, and the 720-position damping adjustment is the headline figure that separates it from the entry-level fast-road option. Construction follows XYZ’s standard coilover architecture, with height-adjustable perches so ride height and spring preload can be set independently of damping. It is aimed at drivers who want more control over how the car sits and reacts than the factory suspension gives them, without moving into the compromises of a full race-only setup. For a B6 S4 owner, that translates into a kit capable of firming up for a spirited drive or a track session, then settling back into something usable for the rest of the week.

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 is matched to the quattro drivetrain layout of this generation, so confirm your car is the 4WD B6 S4 rather than a related A4 variant before ordering.

What buyers also search for

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Spec your ride height and damping range for the B6 S4 and configure yours below.