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S4 · Handling

S4 Rear sway bar

Your S4

Pick your year to see what fits.

This page covers US S4s only. The S5 has its own page.

Less understeer
Medium$330–$3601–3 hrs
All S4 mods

Why do it

Cuts understeer and body roll, one of the best handling mods for these cars.

Tools you'll need

Starting out? See our budget tool list.

Parts to buy

Double-check fitment before buying. We may earn a commission when you buy through these links, at no extra cost to you.

Steps

  1. Lift and soak

    • Raise the car and soak the bolts.
    Watch this step (034 on a B5 S4) (6:39–9:40)

  2. Remove the stock bar

    • Undo the end links and brackets.
    Watch this step (9:40–12:21)

  3. Fit the brackets

    • Bolt on the support brackets.
    Watch this step (14:24–19:13)

  4. Fit the new bar

    • Grease the bushings and put the bar in.
    Watch this step (19:13–21:18)

  5. Secure everything

    • Bolt up the end links and tighten it all.
    Watch this step (21:18–26:13)

  6. Remove the wheels

    • Raise the rear and remove the wheels.
    Watch this step (034 on a B7 A4; same chassis) (1:16–1:33)

  7. Undo the end links

    • Disconnect the end links.
    Watch this step (1:33–2:04)

  8. Undo the bracket

    • Unbolt the bracket.
    Watch this step (2:04–2:42)

  9. Lower the exhaust

    • Lower the exhaust for room and swap the bar.
    Watch this step (2:42–6:26)

  10. Refit the exhaust

    • Put the exhaust hangers back.
    Watch this step (6:26–6:55)

  11. Soak the bolts

    • Spray the bolts with penetrating fluid.
    Watch this step (034 on a B8) (0:24–0:41)

  12. Remove the stock bar

    • Undo the end links and brackets, and take the bar out.
    Watch this step (0:41–1:28)

  13. Fit the new bar

    • Grease the bushings, lift the new bar in and tighten everything.
    Watch this step (1:28–5:48)

  14. Drop the exhaust

    • Lower the exhaust for room.
    Watch this step (034 bar on a B9 S4) (0:18–1:24)

  15. Remove the stock bar

    • Undo the end links and brackets, and take it out.
    Watch this step (1:24–2:14)

  16. Prepare the parts

    • Grease the bushings and set up the end links.
    Watch this step (2:14–4:10)

  17. Install the new bar

    • Fit it, then refit the exhaust.
    Watch this step (4:32–6:30)

How to know it worked

Did this guide work for you?

Safety first

  • Park on flat ground, set the parking brake and chock the wheels.
  • Never get under a car held up only by a jack. Use jack stands.
  • Let the engine and exhaust cool first.
  • Disconnect the battery before unplugging electrical parts.
  • Wear safety glasses.
  • If something doesn't match your car, stop and ask a shop.

Follow your part's instructions and your service manual's torque specs.