Valvetronic Designs 400 Cell Catted Downpipes - Porsche 992 Turbo / Turbo S

Precision Engineered for the 3.8L Twin-Turbo Flat-Six • High-Flow • Compliant • 

Introducing Our NEW 400 Cell EPA-Compliant Downpipes for 992 Turbo

The Porsche 992 Turbo and Turbo S represent the pinnacle of modern forced-induction performance. While the 3.8L twin-turbo flat-six delivers exceptional power from the factory, restrictive catalysts limit exhaust efficiency and mute the engine’s true character. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce backpressure, enhance turbo responsiveness, and refine the exhaust signature — all while maintaining emissions compliance standards.

This upgrade elevates performance while preserving the precision expected from Porsche.

Why Upgrade to 400 Cell?

• EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.
• Improved Turbo Response: Reduced restriction enhances spool characteristics and throttle precision.
• Enhanced Exhaust Presence: Deeper tone with improved clarity at higher RPM.
• Maintained Drivability: Noticeable gains without sacrificing refinement or daily comfort.

Engineering & Performance

• 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 sustained boost levels.
• Direct OEM Bolt-On Installation: Utilizes factory mounting locations for seamless installation.
• Engineered to Pair with Valvetronic Exhaust Systems

Sound Character

• Stock Exhaust + Downpipes: Subtle increase in depth and presence with improved turbo clarity.
• Valvetronic Exhaust + Downpipes: Sharper response, stronger turbo acoustics, and a more motorsport-inspired tone while retaining Porsche composure.

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-performance conditions