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Milltek Large Bore Downpipe Hi-Flow Sports Cat | BMW 428i F32
SKU: SSXBM977
Documents
Description
Milltek Large Bore Downpipe with integrated Hi-Flow Sports Catalyst for BMW 428i (F32). Direct factory fitment when paired with Milltek Cat-Back Exhaust System. Mandrel-bent T304L stainless steel construction with CNC-formed catalyst housing delivers increased flow over OEM restrictive units.
Larger diameter core expands exhaust gas velocity and reduces backpressure, unlocking additional power and torque. Hi-Flow catalyst maintains street-legal emissions compliance while allowing full acoustic character expression. Stage 2 ECU remap required to extract peak performance and recalibrate fuel delivery.
Fitment:
- BMW 428i F32 (2014-2016)
- Requires Milltek Cat-Back System for complete fitment
- Uses OEM exhaust hangers — no modification required
- Stage 2 tune mandatory
Hand-finished welds and TIG construction throughout. This downpipe unlocks the full potential of your F32 when combined with proper engine management.
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Key Facts
| Pipe Diameter | 76.20 |
| 0 hours to fit (including removing OE system) | |
| Race Product | Yes |
| EMarked | No |
System Fitment List
Shipping Information
This system ships in 1 box.
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