Downpipe for BMW 3 Series: Aluminium Alloy
This downpipe for the BMW 3 Series is specified around aluminium alloy, which decides how it behaves in service far more than the part name does. We build to a written specification — base material, dimensions, finish and packing — and hold that specification on file so every reorder reproduces the approved piece.
The usual reason a programme changes supplier is not unit price. It is warranty claims traced back to a single lot, or lead time that slipped twice before bulk started. Both are specification problems, and both are preventable.
Specification
| Product | Downpipe |
|---|---|
| Vehicle application | BMW 3 Series |
| Material / finish | Aluminium Alloy |
| Typical use | Coastal Delivery |
| MOQ | 200 pieces per specification |
| Sampling | 10 working days, 5 days per revision |
| Bulk lead time | 15-40 days after approval |
| Compliance | IATF 16949 |
| Packing | 10 pieces per inner box, 500 per carton |
Material options
- Carbon Fibre Composite — the cost-effective default for volume programmes
- Reinforced Nylon — chosen where wear resistance comes first
- Natural Rubber — preferred when weight matters more than rigidity
- Brass — selected when the part is exposed to weather and road salt
- Sintered Metal — chosen where wear resistance comes first
Processes available
- precision stamping
- gravity casting
- powder coating
- rubber vulcanisation
- robot welding
- die casting
Fitment notes
Confirm the fitment against the VIN or the frame number before ordering; two model years often share a name and not a part.
Where it is used
The specification above is the one most often ordered for coastal delivery. Related applications include urban courier work, mining sites, track days, mountain roads, food delivery.
Quality and packing
- In-line inspection with AQL 1.5 sampling on every lot.
- Dimensional report issued against the approved drawing.
- Carton marking and barcode to your specification.
- Golden sample retained at the factory as the reorder reference.
Questions buyers ask
Can the specification be held on file?
Yes. Once approved, the specification is recorded against your part number so a reorder reproduces the IATF 16949-compliant build instead of a fresh interpretation.
How long does sampling take?
Samples leave the factory in 10 working days, and each revision round adds about 5 days once you have seen the first piece.
How is packing specified?
Individual packing, inner box quantity and carton marking are confirmed at quotation stage so the cartons arrive ready for your warehouse.
What testing is included?
Standard lots ship with dimensional and hardness reports. IATF 16949 documentation is issued with the shipment when your market requires it.
Share a sample or a drawing and we will quote against a written specification, not against a photograph.
