XYZ Racing Tarmac Rally Coilovers — Audi A6 4B/C5 4WD 1997-2005

The A6 4B/C5’s quattro drivetrain runs a longitudinal engine and full-time all-wheel drive, so on loose or mixed-grip stages the load comes through all four corners at once rather than pivoting off the nose the way a front-driven car does. XYZ Racing’s Tarmac Rally coilover for the 4B/C5 platform (1997-2005) is built around that fact: a damper tuned to keep the tyres loaded through compressions and crests instead of letting them skip across broken surfaces.

This is the sealed-stage tarmac rally application – a mid-size quattro saloon or Avant taking hits at speed on cambered, patched, sometimes wet public-road surfaces, not a smooth circuit. The valving prioritises controlling body movement over sharp inputs while still letting each corner follow what’s underneath it.

What this coilover does for your 1997-2005 Audi A6 4B/C5 4WD

On a car this size and weight, running rally-surface terrain, the biggest control cost is what happens to the body over a bump mid-corner – if the chassis pitches, the outside tyre’s contact patch goes with it. This damper absorbs that impact rather than passing the full jolt into the body, so the tyre stays loaded and the quattro system has something to put its power down through. A hidden crest or a pothole disguised by shadow gets soaked up instead of deflected, which keeps the car settled into the next direction change rather than unloading mid-corner. The practical result on the 4B/C5 is a chassis that holds its line over broken surfaces at speed, with the traction advantage of quattro actually reaching the road instead of being interrupted by a wheel that’s briefly airborne.

About the Tarmac Rally coilover

The Tarmac Rally is XYZ Racing’s damper for exactly this kind of stage: broken, uneven tarmac taken at speed, where the surface itself is the obstacle rather than a smooth apex. Its valving is built to absorb the impact of rough pavement and bigger compressions without transmitting the full shock into the body shell, which is what keeps the tyre in contact with the road instead of skipping across it. That control turns directly into traction – a tyre that stays loaded grips, one that’s bouncing doesn’t – and on a 4WD platform like the A6, traction is the entire point of the drivetrain. The damping isn’t a lab estimate; XYZ carried these settings over from its own tarmac rally programme, where this absorb-and-settle behaviour was tuned stage by stage rather than on a bench. On the 4B/C5, that means a kit built to keep the car planted and predictable rather than reactive, so the driver works with the chassis instead of constantly correcting it.

Fitment for the Audi A6 4B/C5 4WD (1997-2005)

This kit is built specifically for the Audi A6 4B/C5 quattro, chassis code AU29-1, across the full 1997 to 2005 production run. It’s specced for the 4WD driveline variants of the 4B/C5 generation – confirm your car matches this chassis code before ordering, since the 4B/C5 range spans more than one body style and driveline configuration.

What buyers also search for

• Audi A6 4B/C5 quattro suspension upgrade for rally and fast-road use
• Audi A6 4B/C5 Tarmac Rally coilover for uneven, broken-surface driving
• Audi A6 4B/C5 4WD damper setup built around quattro traction
• Audi A6 AU29-1 chassis coilover kit for 1997-2005 models

Spec is built around the 4B/C5’s quattro layout and the Tarmac Rally’s stage-bred damping – configure yours below.