BMW 5 Series Exhaust System: Specs, Fitment & Common Faults
On the 5 Series, related engines can genuinely automatically sense when a regen is needed and raise the exhaust temperature themselves.
Illustration for editorial purposes
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OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 247-037 / Walker 23496
| Rear silencer (back box) — aftermarket | Bosal 247-037, 247-981, 247-413 (need accessories); Walker 23496 (930 mm, 8.65 kg, code 53, filled), 05924 (1170 mm, code 53); Ernst 251006; MTS 01.60519 (580 mm); Vegaz BS-260EBER (975 mm), BS-223EBER (990 mm), BS-380 (580 mm), BS-154IMA (1130 mm), BS-83, BS-85; Polmo 03.28, 03.07 (without cat), 03.67 |
|---|---|
| Centre / intermediate silencer — aftermarket | No Bosal/Walker/MTS; Vegaz BS-134, BS-140 (670 mm), BS-136 (690 mm), BS-294IMA (950 mm), BS-295EBER; Polmo 03.51, 03.63 (without cat); Ernst 275002/275040 (750 mm repair solutions) |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | or DPF: Walker 28182 (420 mm, 3.5/6.19 kg, code 91, with manifold and fitting parts); Vegaz BK-888 (Euro 5), BK-894 (Euro 6), BK-848 (830 mm, Euro 4, OBD), BK-810 (700 mm, Euro 4); BM Catalysts BM92223H (Euro 6, FK92223), BM80546H (Euro 4), BM91455H (Euro 3); JMJ 1091615 (830 mm), 1080254 (720 mm), 1080161 (M57, Euro 3); Ernst 750141 (cyl 1-3, Euro 3); AS 45310 (Euro 6); NAP CAK11612 (Euro 5) |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Match engine code, fuel and emissions standard. |
BMW 5 Series Exhaust System: The Part That Announces Its Own Problems
On the BMW 5 Series, this is one of the few parts where your ears will catch a problem before your eyes do — a new rattle, a drone, noise that simply wasn't there a week ago. That's a genuine advantage, since it gives you an early warning most other faults don't offer.
BMW 5 Series Exhaust System: What It Does
On the BMW 5 Series, burnt gases leave the engine through the exhaust system, which quiets them via the silencer and treats emissions through a catalytic converter and particulate filter before anything exits the tailpipe. Petrol and diesel versions frequently use entirely different systems, since their emissions treatment needs aren't the same.
BMW 5 Series Exhaust System: Watch: Replacing It
F10 axle-back (rear silencer) install.
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A Genuinely Useful Piece of Context Worth Knowing About DPF Regeneration — BMW 5 Series Exhaust System
If you're worried about the DPF on this diesel, this is genuinely useful to know: related BMW engines can genuinely sense when the DPF needs to regenerate and will automatically raise the exhaust temperature during normal driving, without needing sport mode manually selected.
It's also genuinely worth knowing that if your regular driving is mostly short journeys, giving the car a proper, sustained run at higher revs for around 20 to 30 minutes every six to eight weeks can help ensure the DPF gets a genuine opportunity to regenerate fully.
BMW 5 Series Exhaust System: Warning Signs, DIY Difficulty & Aftermarket Advice
These are the same regardless of make or model — see our full Exhaust System Guide for warning signs and fault codes to watch for, confirming fitment against your VIN, and which aftermarket brands are worth trusting.
More BMW Exhaust System
The same part, covered across other BMW models.