Change Car Rear Silencer BMW X4
Change Car Rear Silencer
| Estimated time | 1h00–1h30 |
|---|---|
| Estimated labour cost | ~100–150£ |
| Difficulty | Easy |
| Repair the silencer* | 1h30 |
| Remove/refit the front silencer | 1h00–2h00 |
| Renew the front silencer | 1h00–2h00 |
| Repair the front silencer* | 1h30 |
| Align the front silencer* | 0h30 |
| Repair the main silencer* | 1h30 |
| Align the main silencer* | 0h30 |
| Difficult main silencer removal* | 0h30 |
| Repair the rear silencer* | 1h30 |
| Weld a sheet-metal repair panel onto the rear silencer* | 0h45 |
| Difficult rear silencer removal* | 0h30 |
| Remove/refit the silencer | 1h00–1h30 |
| Renew the silencer | 1h00–1h30 |
| Repair the main silencer | 0h30 |
| Remove/refit the rear silencer | 0h45–1h30 |
| Renew the rear silencer | 0h45–1h30 |
| Repair the rear silencer | 0h30 |
| Remove/refit the rear left silencer trim | 0h30 |
| Renew the rear left silencer trim | 0h30 |
| Remove/refit the rear right silencer trim | 0h30 |
| Renew the rear right silencer trim | 0h30 |
| Remove/refit both rear silencer trims | 0h30 |
| Renew both rear silencer trims | 0h30 |
What is a BMW X4 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 X4 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 X4 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.
2 models covered
| Model | Year Range | Engines covered | Fuel |
|---|---|---|---|
| X4 2014-2018 | 2014-2018 | M40i Petrol (N55B30A), xDrive 20d Diesel (B47D20A), xDrive 20d M Performance Diesel (B47D20A), xDrive 20i Petrol (N20B20A), xDrive 28i Petrol (N20B20A), xDrive 30d Diesel (N57D30A), xDrive 30d Diesel (N57D30A), xDrive 30d M Performance Diesel (N57D30A), xDrive 35d Diesel (N57D30… | Diesel, Petrol |
| X4 2018-2025 | 2018-2025 | M Competition Petrol (S58B30A), M Petrol (S58B30A), M40d Diesel (B57D30B), M40d mHev 48V (MHEV),Diesel (B57D30B+JA1), M40i mHEV 48V (MHEV),Petrol (B58B30B), M40i Petrol (B58B30A), M40i Petrol (B58B30B), xDrive 20d Bi-Turbo Diesel (B47D20B), xDrive 20d Bi-Turbo Diesel (B47D20B), … | 48V (MHEV), Diesel, Petrol |
