Land Rover Defender Exhaust System: Specs, Fitment & Common Faults
On the Defender, a professional DPF clean on related models has genuinely been documented as only a temporary fix, worth understanding the motorway-speed requirement for a full regen cycle.
Illustration for editorial purposes
Opens live listings in a new tab.
OEM Part Number: confirm via VIN — Rear silencer (aftermarket) Bosal 211-403 / Walker 22664
| Rear silencer (back box) — aftermarket | Bosal 211-403, 211-395, 211-393 (need accessories); Walker 22664 (450 mm, 8.06 kg, code letter 52), 21915 (970 mm, 9.65 kg, code letter 53), both no fitting parts; MTS 01.60357 (1000 mm, 7.3 kg), 01.96500 (1000 mm, 9.25 kg), 01.96250 (950 mm), trim codes listed; Vegaz MOS-115 (970 mm), MOS-116 (940/1000 mm, trim code...6409), MOS-206 (970 mm); Polmo 53.01, 53.03, 53.08, 53.10, 53.12; Izawit 44.001 (970 mm, 7.3 kg); also ASSO 42.7040 |
|---|---|
| Centre / intermediate silencer — aftermarket | Vegaz MOS-209 (800 mm), MOS-84 (750 mm), MOS-159IMA (centre, 1075 mm); Bosal/Walker/IMASAF named as brands but no part numbers shown |
| Front pipe / catalytic converter (DPF on diesels) — aftermarket | Vegaz MOK-949 (Euro 6), MOK-806 (Euro 5), MOK-933 (Euro 3); BM Catalysts BM80781H (Euro 6, only with FK80781), BM91170H (Euro 4); JMJ 1080321 (engine 448DT), 1080388, 1080232, 1090002; Bosal 099-758 (Euro 2, old). Mostly old L316-era units |
| Genuine (OE) numbers quoted | None quoted in catalogue listings — order genuine parts against your VIN |
| Fitment notes | Product years in labels (2009-2026) are catalogue labels, not fitment. L663 is a 2.0 petrol/diesel and 3.0 mild-hybrid range, none mapped. Try the category links on the site to isolate L663. |
Land Rover Defender Exhaust System: The Part That Announces Its Own Problems
On the Land Rover Defender, most faults are things you'd spot visually first, but this one usually announces itself acoustically — a rattle, a drone, a noticeable jump in noise levels. That's actually helpful, since it means you'll likely notice trouble well before it gets serious.
Land Rover Defender Exhaust System: What It Does
Three jobs happen inside the Land Rover Defender's exhaust system: routing burnt gases away from the engine, quieting them through the silencer, and treating emissions via a catalytic converter and particulate filter. Petrol and diesel variants often need completely different systems to meet their respective emissions requirements.
Land Rover Defender Exhaust System: Watch: Replacing It
exact L663 exhaust fitting
Opens live listings in a new tab.
A Genuinely Useful Piece of Context Worth Knowing About DPF Regeneration — Land Rover Defender Exhaust System
If you're facing a persistent DPF warning, this is genuinely worth knowing: documented cases on related Land Rover models describe a professional DPF clean only providing a temporary fix, with the red warning light returning within weeks on some cars, worth asking what's causing repeated blockages rather than accepting repeated cleans as a permanent solution.
It's also genuinely worth knowing that on diesel models fitted with AdBlue, topping off the fluid tank every two to three tanks of fuel, rather than waiting for a low-level warning, can help avoid the fluid crystallising at very low levels.
Land Rover Defender 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 Land Rover Exhaust System
The same part, covered across other Land Rover models.