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Milltek Secondary Cat Bypass | BMW G8X M3 M4
SKU: SSXBM1341
Description
102mm single mid pipe non-resonated X pipe secondary catalyst bypass for BMW G8X M3 and M4. Bolts directly to OE axle back (SSXBM1342) or Milltek axle back exhaust (SSXBM1341). Track-focused configuration eliminates secondary catalyst restriction while maintaining OEM+ fitment and hanger compatibility.
Hand-finished T304L stainless steel construction with mandrel-bent piping. Non-resonated design optimized for closed-course and track use. Dyno-proven power gains with engineered tone character across the RPM range.
- Fits BMW G8X M3 (S58 engine) and M4 (S58 engine)
- Direct bolt-on to OE or Milltek axle back systems
- Uses factory hangers and mounting points — no modification required
- T304L stainless steel, hand-finished
- Mandrel-bent X pipe configuration
- Track/closed-course optimized — non-resonated
- Valve-compatible for OE secondary valve functionality
In-house manufacturing from raw stainless steel to finished component ensures precision fit and durability.
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Key Facts
| Pipe Diameter | 101.60 |
| 1.5 to 2 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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