Change Car Rear Silencer BMW 7-Series
Change Car Rear Silencer
| Estimated time | 1h00–2h30 |
|---|---|
| Estimated labour cost | ~100–250£ |
| Difficulty | Easy |
| Remove/refit the silencer | 1h00–2h30 |
| Renew the silencer | 1h00–2h30 |
| Repair the silencer* | 1h30 |
| Repair the front silencer* | 1h30 |
| Align the front silencer* | 0h30 |
| Remove/refit the main silencer | 1h30–2h30 |
| Renew the main silencer | 1h30–2h30 |
| Repair the main silencer | 0h30–0h45 |
| Align the main silencer* | 0h30 |
| Difficult main silencer removal* | 0h30 |
| Remove/refit the rear silencer | 0h45–3h00 |
| Renew the rear silencer | 0h45–3h00 |
| Repair the rear silencer | 0h30 |
| Weld a sheet-metal repair panel onto the rear silencer* | 0h45–6h00 |
| Difficult rear silencer removal* | 0h30 |
| Remove/refit the front silencer | 1h00–1h30 |
| Renew the front silencer | 1h00–1h30 |
| Repair the front silencer | 0h45 |
| Align the front silencer | 0h30 |
| Align the main silencer | 0h30 |
| Remove/refit the rear silencer trim | 0h30 |
| Renew the rear silencer trim | 0h30 |
| Repair the main silencer* | 1h30 |
| Repair the rear silencer* | 1h30 |
What is a BMW 7-Series 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 7-Series 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 7-Series 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.
3 models covered
| Model | Year Range | Engines covered | Fuel |
|---|---|---|---|
| 7-Series 2001-2008 | 2001-2008 | 730d Diesel (M57D30TU), 730d, Ld Diesel (M57D30T2), 730i, Li Petrol (M54B30), 730i, Li, -LPG LPG,Petrol (N52B30A), 735i, Li, -LPG LPG,Petrol (N62B36A), 740d Diesel (M67D39), 740i, Li Petrol (N62B40A), 745d Diesel (M67D44), 745i, Li, -LPG LPG,Petrol (N62B44A), 750i, Li, -LPG LPG,… | Diesel, LPG, Petrol |
| 7-Series 2008-2015 | 2008-2015 | 725d Diesel (N57D30A), 730d Diesel (N57D30A), 730d, -xDrive Diesel (N57D30A), 730d, -xDrive Diesel (N57D30A), 740d, -xDrive Diesel (N57D30B), 740d, -xDrive Diesel (N57D30B), 740i Petrol (N54B30A), 740i Petrol (N55B30A), 750d, -xDrive Diesel (N57D30C), 750i, Li, -xDrive Petrol (N… | Diesel, Petrol |
| 7-Series 2015-2025 | 2015-2025 | 725d Diesel (B47D20B), 725d, Ld Diesel (B47D20B), 730d, Ld, -xDrive Diesel (B57D30A), 730i, Li Petrol (B48B20B), 740d xDrive Diesel (B57D30B), 740e, Le iPerformance Electricity,Petrol (B48B20B+GC1), 740i, Li Petrol (B58B30A), 740i, Li, -xDrive Petrol (B58B30C), 750d, Ld, -xDrive… | Diesel, Electricity, Petrol |
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