{"type":"firestarter.listing","listing":{"id":"lst_i8ewgTri","product_name":"BMW F80/F82/F83/F87C M2C / M3 / M4 400 Cell Catted Downpipes","category":"Motor Vehicle Exhaust","description":"BMW F8X M3 / M4 – EPA-Compliant 400 Cell Catted Downpipes\nEngineered for the S55 Twin-Turbo Inline-6 • High-Flow • Compliant •\n\nIntroducing Our NEW 400 Cell EPA-Compliant Downpipes for the F8X Platform\nThe BMW F8X M2, M3 and M4 are icons of modern performance, powered by the high-revving S55 twin-turbo inline-6. While the factory catalysts prioritize restriction and sound suppression, our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to unlock improved exhaust flow, sharper throttle response, and a more aggressive turbo character — all while maintaining emissions compliance standards.\nThis is where the S55 truly comes alive.\n\nWhy Upgrade to 400 Cell?\n\n\nEPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.\n\nFaster Turbo Spool: Reduced backpressure enhances responsiveness and mid-range torque delivery.\n\nSharper Exhaust Tone: Cleaner, more pronounced turbo acoustics with a deeper overall note.\n\nStreet & Track Balanced: Noticeable performance gains without sacrificing daily drivability.\n\n\nPerformance & Engineering\n\n\nOptimized Flow Design: Minimizes restriction while preserving catalyst efficiency.\n\nMandrel-Bent Tubing: Ensures smooth internal transitions and consistent exhaust velocity.\n\nPrecision TIG Welding: Built to endure high exhaust temperatures and sustained boost pressure.\n\nDirect OEM Bolt-On Installation: Utilizes factory mounting points for straightforward installation.\nEngineered to Pair Seamlessly with Valvetronic Exhaust Systems\n\n\nSound Transformation\n\n\nStock Exhaust + Downpipes: Noticeable increase in volume with stronger turbo presence and improved clarity.\n\nValvetronic Exhaust + Downpipes: Maximum transformation — sharper crackles, enhanced turbo whistle, and a more aggressive high-RPM character.\n\n\nConstruction & Durability\n\nPremium high-grade stainless steel construction\nHigh-temperature resistant 400 cell catalyst cores\nOEM-style sensor placement for proper op","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08011_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08027_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08034_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08044_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08036_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08078_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08084_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08038_ShopifyCustomSize.jpg?v=1784213555","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08041_ShopifyCustomSize.jpg?v=1784213555","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08068_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08091_ShopifyCustomSize.jpg?v=1784213555","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08098_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08020_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08105_ShopifyCustomSize.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08128_ShopifyCustomSize_0d20786d-7ec8-4265-b142-3bad7dcca08b.jpg?v=1784213554","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08062_ShopifyCustomSize.jpg?v=1784213555","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08066_ShopifyCustomSize.jpg?v=1784213555"],"price":2249.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-07-16T16:00:45.298Z"},"share_url":"https://firestarter.network/l/lst_i8ewgTri","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_i8ewgTri' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy BMW F80/F82/F83/F87C M2C / M3 / M4 400 Cell Catted Downpipes' and a budget_max comfortably above $2249.99 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."]}}