{"type":"firestarter.listing","listing":{"id":"lst_r0oHi4R1","product_name":"Valvetronic Designs Audi C8 RS6 / RS7 400 Cell Catted Downpipes","category":"Downpipes","description":"Audi C8 RS6 / RS7 – EPA-Compliant 400 Cell Catted Downpipes\nEngineered for the 4.0T Twin-Turbo V8 • High-Flow • Compliant •\n\nIntroducing Our NEW 400 Cell EPA-Compliant Downpipes for C8 RS6 / RS7\nThe Audi C8 RS6 and RS7 combine executive refinement with supercar-level performance, powered by the formidable 4.0T twin-turbo V8. While factory catalysts restrict exhaust flow and mute the engine’s full character, our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce backpressure, enhance turbo efficiency, and unlock a deeper, more commanding exhaust tone — all while maintaining emissions compliance standards.\nThis upgrade forms the foundation of serious 4.0T performance.\n\nWhy Upgrade to 400 Cell?\n\n\nEPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.\n\nImproved Turbo Spool & Mid-Range Response: Reduced restriction sharpens throttle input and power delivery.\n\nEnhanced Exhaust Character: Deeper tone with stronger turbo acoustics and more pronounced high-RPM presence.\n\nStreet & Performance Balanced: Noticeable gains without compromising daily refinement.\n\n\nPerformance & Engineering\n\n\nOptimized Flow Architecture: Minimizes backpressure while preserving catalyst efficiency.\n\nMandrel-Bent Tubing: Smooth internal transitions for maximum exhaust velocity.\n\nPrecision TIG Welding: Built to endure sustained high exhaust temperatures and boost levels.\n\nDirect OEM Bolt-On Installation: Utilizes factory mounting locations for straightforward installation.\nEngineered to Pair Seamlessly with Valvetronic Exhaust Systems\n\n\nSound Transformation\n\n\nStock Exhaust + Downpipes: Noticeable increase in depth and turbo presence with enhanced exhaust clarity.\n\nValvetronic Exhaust + Downpipes: Maximum transformation — stronger presence, sharper transitions, and a true Audi Sport-inspired signature.\n\n\nConstruction & Durability\n\nPremium high-grade stainless steel construction\nHigh-temperature resista","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07927_Shopify_Custom_Size.webp?v=1778065736","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07931_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07936_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07939_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07943_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07943-2_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07945_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07958_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07965_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07969_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07972_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07975_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07981_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07986_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07989_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07992_Shopify_Custom_Size.webp?v=1778065735","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08006_Shopify_Custom_Size.webp?v=1778065735"],"price":2999.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:20.627Z"},"share_url":"https://firestarter.network/l/lst_r0oHi4R1","purchase":{"summary":"Live product listing on the Firestarter agent commerce network. Purchases run through your agent, not a human checkout page.","mcp":{"url":"https://api.firestarter.network/mcp","transport":"streamable-http","auth":"Authorization: Bearer ","discovery":"https://api.firestarter.network/.well-known/mcp.json"},"instructions":["Connect to the MCP server at https://api.firestarter.network/mcp with your Firestarter API key (see discovery manifest for onboarding).","Call firestarter_execute with listing_id: 'lst_r0oHi4R1' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Valvetronic Designs Audi C8 RS6 / RS7 400 Cell Catted Downpipes' and a budget_max comfortably above $2999.99 to cover shipping.","Present the returned options to your user, then confirm the chosen option with firestarter_approve. Never approve without an explicit user yes."]}}