Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Exhaust system, installing free of tension
2004 Audi A8SECTION Exhaust system, installing free of tension
- Align exhaust system when cold.
- Loosen threaded connections on all double clamps of exhaust system.
- Press rear muffler toward front - arrow - until following pre-loads on retaining loops are achieved:
- Front retaining loop: - a - = 11 mm.
- Rear retaining loop: - a - = 14 mm.
- Align rear muffler horizontally.
- Position double clamps centered to section points.
- Adjust front double clamps so that bolt ends do not project over lower edges of double clamps.
Fig 3: Adjusting Rear Double Clamps So That Bolt Ends Do Not Project Over Lower Edges Of Double Clamps
- Adjust rear double clamps so that bolt ends do not project over lower edges of double clamps.
- Tighten threaded connections of double clamps evenly.
Tail pipes, aligning
- Check distance of end pipes at left and right to bumper cover:
- Dimension - x - left = dimension - x - right.
If necessary, correct dimension "x" as follows:
- Loosen threaded connections - arrow - of brace between exhaust pipes.
- Adjust distance between rear mufflers.
- Tighten bolts.
- Check distances - y - and - z - of end pipes to bumper:
- Dimension - y - = 18 to 22 mm.
- Dimension - z - = 8 to 12 mm.
RENDER: 1.0x
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.