Description
High Flow Engineering S55 Decat Downpipes Performance Exhaust Upgrade
Unlock the full performance potential of your BMW M2 F87 Competition or CS with the HFE S55 3″ Decat Downpipes. By replacing the restrictive factory catalytic converters, these high-flow downpipes significantly reduce exhaust backpressure, improve turbo efficiency, and allow the S55 twin-turbo engine to deliver stronger performance and sharper throttle response, particularly on tuned vehicles.
⚠ IMPORTANT – ROAD USE, EMISSIONS & MOT NOTICE
These decat downpipes remove the factory catalytic converters and are intended for off-road or motorsport use only. They are not UK emissions compliant and will result in a UK MOT emissions failure. ECU tuning is strongly recommended after installation.
Key Features＋
- High-Flow 3″ Decat Design: Eliminates restrictive OEM catalytic converters.
- Improved Turbo Response: Reduced backpressure allows faster spool.
- Performance-Grade Stainless Steel: Built to withstand extreme exhaust temperatures.
- Mandrel-Bent Tubing: Smooth internal flow for optimal gas evacuation.
- Enhanced Exhaust Note: Deeper and more aggressive sound under acceleration.
- Direct-Fit Installation: Designed as a direct OEM replacement.
Why Upgrade S55 Downpipes?＋
- The factory catalytic converters are a major restriction on tuned S55 engines.
- Improves throttle response and mid-range torque.
- Essential supporting modification for Stage 2 builds.
- Optimises exhaust gas flow at high RPM.
- Pairs perfectly with upgraded intakes, charge pipes and intercoolers.
Technical Specifications＋
- Material: High-grade 304 stainless steel
- Configuration: Decat (no catalytic converters)
- Construction: Mandrel bent & welded
- Fitment: Direct OEM replacement
- Engine: S55 Twin Turbo
Vehicle Compatibility＋
- BMW M2: F87 Competition or CS
✔ S55 twin-turbo engine only
✔ Compatible with factory and most aftermarket exhaust systems
✔ ECU tuning required
Installation＋
- Remove factory downpipes and catalytic converters.
- Install HFE decat downpipes using OEM mounting points.
- Check clearances and tighten all connections securely.
- ECU remapping required before driving.
- Professional installation strongly recommended.
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