Manufacturer SKU: BMW.B58.GEN3.FF.400C.BR BMW GEN3 B58– EPA-Compliant 400 Cell Catted Downpipes Engineered for the Gen 3 B58 Turbocharged Inline-6 • High-Flow • Compliant • Introducing Our NEW 400 Cell EPA-Compliant Downpipes for the GEN3 B58 Platform The Gen 3 B58 (B58N) turbocharged inline-6 is one of BMW’s most capable modern engines, known for its immense tuning potential and smooth power delivery. However, factory catalysts restrict exhaust flow and limit turbo efficiency. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce backpressure, improve turbo spool characteristics, and unlock a deeper, more aggressive exhaust tone — all while maintaining emissions compliance standards. This upgrade lays the foundation for increased performance on both stock and tuned vehicles. Why Upgrade to 400 Cell? - EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards. - Faster Turbo Spool: Reduced restriction enhances responsiveness and mid-range torque. - Increased Tuning Headroom: Supports higher boost levels compared to restrictive factory catalysts. - Enhanced Exhaust Character: Deeper tone with stronger turbo acoustics and sharper crackles. Performance & Engineering - Optimized Flow Architecture: Minimizes backpressure while preserving catalyst efficiency. - Mandrel-Bent Tubing: Smooth internal transitions for maximum exhaust velocity. - Precision TIG Welding: Built to withstand high exhaust temperatures and elevated boost pressure. - 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 — enhanced crackles, sharper 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 tuned applications Unlock the full performance potential of your B58N — starting at the source. 📩 Questions or ordering assistance? customerservice@valvetronic.com