Valvetronic Designs BMW G8X M3 / M4 400 Cell Catted Downpipes

The BMW G8X 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.

Fits: BMW S58: M3 (G80/G81), M4 (G82/G83), M2 (G87). Confirm your exact car with us before ordering.

Brand: Valvetronic Designs · Part #: BMW.G8X.M2.M3.M4.FF.400C.BR

For off-road / competition use only. Not legal for use on public roads in the United States, including California.

• Ships from the brand or distributor, usually in 3–7 business days.
• Free US shipping on orders over $250.
• Unused parts can be returned within 30 days. Some items are marked no-refund in their description.

Full details are on our shipping and returns page.