BMW M3 M4 G80 G82 S58 3" Decat Downpipes with Flexi | T304 Stainless | TIG Welded
Upgrade your BMW M3 or M4 with our stainless steel 3 inch decat downpipes with flexi for the G80 G82 S58. These high-performance, catless downpipes are engineered for maximum power, sharper throttle response and an aggressive exhaust note. Perfect for enthusiasts seeking the ultimate BMW M3 downpipe or BMW M4 downpipe upgrade for the S58 engine.
Why choose these BMW G80 G82 S58 decat downpipes
- Premium material: machined from T304 high-grade stainless steel for durability and corrosion resistance
- In-house TIG welding: high quality welds for strength and reliability
- Flexi section: built-in flexi for easier fitment and reduced stress on the exhaust system
- Performance gains: faster turbo spool, sharper throttle response and noticeable power increases
- Proven results: in our testing we saw gains of around 15–20 bhp
- Improved flow: mandrel-bent for optimal gas flow and maximum internal diameter to maintain mid-range torque
- Lower temps and backpressure: helps relieve the turbocharger for more efficient performance
- Weight saving: substantially lighter than the factory catalytic converters
- Clean look: finished in brushed stainless
Fitment
Designed for the S58 engine in:
- BMW M3 G80
- BMW M4 G82
What you will notice
- More aggressive exhaust sound and enhanced turbo whistle from the S58
- Quicker turbo spool and stronger mid-range pull
- Smoother, freer-revving feel from reduced exhaust backpressure
Real-world feedback
We have used these downpipes ourselves and customer feedback has been excellent, with many noting how easy they are to fit and how transformative the sound and response are on the G80 M3 and G82 M4.
Installation and fitting
Professional installation is recommended as exhaust tolerances can vary slightly and space can be tight. For expert fitting, choose Nforcd in Warwickshire. Request a fitting quote at Sales@nforcd.com.
Recommended extras and notes
- We recommend adding Lambda sensor spacers to help prevent an engine light in most cases
- Cars with OPF filters have sensors that will need to be coded out by a tuner; please speak with your tuner before purchasing
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