Bentley Bentayga V8 – EPA-Compliant 400 Cell Catted Downpipes

Precision Engineered for the 4.0L Twin-Turbo V8 • High-Flow Performance •

Introducing Our NEW 400 Cell EPA-Compliant Downpipes for Cayenne

The Bentley Bentayga V8 platform is a masterclass in performance engineering. However, factory catalyst restrictions limit the full efficiency and character of its 4.0L twin-turbo V8. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce exhaust restriction, improve turbo response, and refine the exhaust note — all while maintaining emissions compliance standards.

Why 400 Cell?

• EPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.
• Improved Turbo Response: Reduced backpressure sharpens throttle input and mid-range delivery.
• Refined Yet Aggressive Sound: Deeper tone with enhanced clarity at higher RPM.
• Maintained Daily Comfort: Performance gains without sacrificing drivability.

Engineering & Performance

• Optimized Flow Design: Reduces restriction while preserving catalyst efficiency.
• Mandrel-Bent Tubing: Smooth internal transitions for consistent exhaust velocity.
• Precision TIG Welding: Built to endure high temperatures and sustained boost pressure.
• Direct OEM Bolt-On Installation: Utilizes factory mounting locations.
• Engineered to Pair with Valvetronic Exhaust Systems

Sound Profile

• Stock Exhaust + Downpipes: Noticeable increase in depth and presence without overwhelming cabin refinement.
• Valvetronic Exhaust + Downpipes: Sharper response, increased volume, and a more motorsport-inspired character 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

Elevate the performance and sound of your Porsche Cayenne — engineered with precision, starting at the source.

📩 Questions or ordering assistance? customerservice@valvetronic.com

Valvetronic Designs shipping & returns

• Returns: new, unused and uninstalled parts within 30 days of purchase, in the original packaging, with a return authorization (RMA) number issued first.
• Restocking fee: 25% on all non-warranty returns; the customer pays return shipping unless the part qualifies for warranty.
• Sound: exhaust sound and tone are personal taste and are not grounds for a return or warranty claim.
• Warranty: lifetime on stainless and titanium tubes and welds, 3 years on mufflers and resonators, 1 year on valves, remotes, electronics and tips. If a problem shows up after install, contact us before removing the part.

To start a return or ask a question, contact us with your order number.