Change Car Rear Silencer BMW Z4

Change Car Rear Silencer

Easy 0h45–2h30 ~75–250£
Estimated time 0h45–2h30
Estimated labour cost ~75–250£
Difficulty Easy
Repair the silencer* 1h30
Repair the front silencer* 1h30
Align the front silencer* 0h30
Repair the main silencer 0h30
Align the main silencer 0h30
Difficult main silencer removal* 0h30
Remove/refit the rear silencer 0h45–2h00
Renew the rear silencer 0h45–2h00
Repair the rear silencer 0h30
Weld a sheet-metal repair panel onto the rear silencer* 0h45–6h00
Difficult rear silencer removal* 0h30
Renew the silencer 0h45–2h30
Align the main silencer* 0h30
Remove/refit the rear silencer trim 0h30
Renew the rear silencer trim 0h30
Remove/refit the silencer 2h00–2h30
Repair the rear silencer* 1h30
Remove/refit the front silencer 1h30
Renew the front silencer 1h30
Repair the main silencer* 1h30

What is a BMW Z4 rear silencer?

The rear silencer (also called the back box or rear muffler) reduces exhaust noise to an acceptable level. It is located at the end of the exhaust line, after the catalytic converter, particulate filter (if fitted), and sometimes an intermediate silencer.

When should you change the BMW Z4 rear silencer?

No periodic replacement interval is specified. Carry out regular visual inspections for corrosion, holes, and deteriorated mounting rubbers. Signs that replacement is needed: louder exhaust noise, rattling from loose baffles, visible rust holes, exhaust fumes entering the cabin, or failure at the MOT/roadworthiness test.

Is it difficult to change the BMW Z4 rear silencer?

Difficulty level 2/5: technically easy but may require effort if bolts and clamps are rusted. Key steps: raise the vehicle, apply penetrating oil to clamp bolts, remove the clamp connecting the silencer to the intermediate pipe, remove the mounting rubber hangers, fit the new silencer with new gasket/clamp, reattach mounting rubbers, check for leaks with engine running.

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3 models covered

Model Year Range Engines covered Fuel
Z4 2003-2009 2003-2009 2.0i Petrol (N46B20B), 2.2i Petrol (M54B22), 2.5i Petrol (M54B25), 2.5i Petrol (N52B25A), 2.5si Petrol (N52B25A), 3.0i Petrol (M54B30), 3.0si, -LPG LPG,Petrol (N52B30A), M Petrol (S54B32) LPG, Petrol
Z4 2009-2016 2009-2016 sDrive 18i Petrol (N20B20A), sDrive 20i Petrol (N20B20A), sDrive 20i Petrol (N20B20A), sDrive 23i Petrol (N52B25A), sDrive 28i Petrol (N20B20A), sDrive 30i Petrol (N52B30A), sDrive 35i Petrol (N54B30A), sDrive 35is Petrol (N54B30A) Petrol
Z4 2019-2025 2019-2025 M40i Petrol (B58B30C), sDrive 20i Petrol (B48B20B), sDrive 30i Petrol (B48B20B) Petrol

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View the service schedule for your Z4 →