Manufacturer SKU: BMW.G8X.M2.M3.M4.FF.400C.BR BMW G8X M2 / M3 / M4 – EPA-Compliant 400 Cell Catted Downpipes Engineered for the S58 Twin-Turbo Inline-6 • High-Flow • Compliant • Introducing Our NEW 400 Cell EPA-Compliant Downpipes for the G8X Platform The BMW G8X M2, M3 and M4 represent the next evolution of M performance, powered by the highly capable S58 twin-turbo inline-6. While factory catalysts prioritize restriction and sound suppression, our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce exhaust backpressure, enhance turbo efficiency, and unlock a sharper, more aggressive exhaust character — all while maintaining emissions compliance standards. This upgrade maximizes the performance potential of the S58 platform without compromising drivability. Why Upgrade to 400 Cell? - EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust flow while maintaining compliance standards. - Improved Turbo Response: Reduced restriction enhances spool speed and mid-range power delivery. - Enhanced Exhaust Character: Deeper tone with more defined turbo acoustics and sharper high-RPM presence. - Street & Track Ready: Noticeable gains while maintaining everyday usability. Performance & Engineering - Optimized Flow Architecture: Minimizes backpressure while preserving catalyst efficiency. - Mandrel-Bent Tubing: Smooth internal transitions for consistent exhaust velocity. - Precision TIG Welding: Built to withstand extreme exhaust temperatures and high boost levels. - Direct OEM Bolt-On Installation: Utilizes factory mounting locations for straightforward installation. - Engineered to Pair Seamlessly with Valvetronic Exhaust Systems Sound Transformation - Stock Exhaust + Downpipes: Noticeable increase in depth and turbo presence with improved exhaust clarity. - Valvetronic Exhaust + Downpipes: Maximum transformation — stronger crackles, enhanced turbo spool acoustics, and a more aggressive overall signature. Construction & Durability - Premium high-grade stainless steel construction - High-temperature resistant 400 cell catalyst cores - OEM-style sensor placement for proper operation - Engineered for long-term reliability under high boost and tuning conditions Unleash the full potential of your S58-powered G8X — starting at the source. 📩 Questions or ordering assistance? customerservice@valvetronic.com