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Milltek Non-Resonated Secondary Cat Bypass | BMW G8X M3 M4
SKU: SSXBM1270
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Description
The Milltek Axle Back Non-Resonated Secondary Cat Bypass is engineered for BMW G8X M3 and M4 models (S58 engine). This performance component replaces the factory secondary catalyst, delivering improved exhaust flow and a sharper acoustic character. Direct fitment to OE downpipes and OE axle-back systems—no modification required.
Hand-finished T304L stainless steel construction with mandrel-bent 76.20mm (3.00") primary bore. Non-resonated design eliminates the OE resonance chamber for full-throttle note clarity. CNC-formed flanges ensure precise factory alignment and OEM hanger compatibility.
- Fitment: BMW G8X M3 (G80) and M4 (G82/G83) with S58 engine
- Material: T304L stainless steel, hand-finished
- Bore: 76.20mm mandrel-bent primary
- Configuration: Non-resonated secondary cat bypass
- Install: Direct replacement—uses factory mounting points and OEM hangers
- Sound character: Aggressive full-throttle note, reduced mid-range resonance
Engineered for serious track and closed-course driving.
Fits OE system.
Designed and manufactured in the UK with 40+ years of performance exhaust heritage. Tested at the Nurburgring.
Key Facts
| Pipe Diameter | 76.20 |
| 2 to 3 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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