{"type":"firestarter.listing","listing":{"id":"lst_sSdAaxeb","product_name":"Audi RSQ8/SQ8/SQ7 400 Cell Catted Downpipes","category":"Motor Vehicle Exhaust","description":"Audi RSQ8 / SQ8 / SQ7 – EPA-Compliant 400 Cell Catted Downpipes\nUnlock the Full Potential of the 4.0T Twin-Turbo V8 • High-Flow • Compliant • \n\nIntroducing Our NEW 400 Cell EPA-Compliant Downpipes for Audi 4.0T\nThe 4.0T twin-turbo V8 powering the Audi RSQ8, SQ8, and SQ7 delivers immense performance — but factory catalyst restrictions hold it back. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to increase exhaust flow, enhance turbo efficiency, and dramatically sharpen the vehicle’s sound profile — all while maintaining emissions compliance standards.\nThis is the foundation of true 4.0T performance.\n\nWhy Upgrade to 400 Cell?\n\n\nEPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust velocity while maintaining compliance standards.\n\nFaster Turbo Spool: Reduced backpressure improves throttle response and mid-range torque delivery.\n\nSharper Exhaust Note: Enhanced turbo acoustics with deeper low-end presence and more aggressive top-end tone.\n\nOptimized Performance Balance: Noticeable gains without compromising daily drivability.\n\n\nPerformance & Engineering\n\n\nOptimized Flow Architecture: Designed to reduce restriction while preserving catalyst efficiency.\n\nMandrel-Bent Tubing: Smooth internal transitions for maximum airflow.\n\nPrecision TIG Welding: Built to withstand extreme exhaust temperatures and boost pressures.\n\nDirect OEM Bolt-On Design: Utilizes factory mounting locations for straightforward installation.\nEngineered to Pair Seamlessly with Valvetronic Titanium Exhaust Systems\n\n\nSound Transformation\n\n\nStock Exhaust + Downpipes: Noticeably louder with stronger turbo character and deeper exhaust tone.\n\nValvetronic Exhaust + Downpipes: Maximum transformation — sharper transitions, increased aggression, and a true RS-inspired exhaust signature.\n\n\nConstruction & Durability\n\nPremium high-grade stainless steel construction\nHigh-temperature resistant 400 cell catalyst cores\nOEM-style sensor placement for proper operation\nEngineered fo","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08120_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08148_ShopifyCustomSize.jpg?v=1784213562","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/edited_square_hero_Shopify_Custom_Size.jpg?v=1784213562","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08143_ShopifyCustomSize.jpg?v=1784213562","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08180_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08123_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08132_ShopifyCustomSize.jpg?v=1784213562","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08152_ShopifyCustomSize.jpg?v=1784213562","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08173_ShopifyCustomSize.jpg?v=1784213562","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08125_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08136_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08128_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08139_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08177_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08186_ShopifyCustomSize.jpg?v=1784213561","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08115_ShopifyCustomSize.jpg?v=1784213561"],"price":3999.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-07-16T16:00:45.292Z"},"share_url":"https://firestarter.network/l/lst_sSdAaxeb","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_sSdAaxeb' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Audi RSQ8/SQ8/SQ7 400 Cell Catted Downpipes' and a budget_max comfortably above $3999.99 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."]}}