{"type":"firestarter.listing","listing":{"id":"lst_yr8hiboT","product_name":"BMW GEN3 B58N 400 Cell Catted Downpipes","category":"Motor Vehicle Exhaust","description":"BMW GEN3 B58– EPA-Compliant 400 Cell Catted Downpipes\nEngineered for the Gen 2 B58 Turbocharged Inline-6 • High-Flow • Compliant • \n\nIntroducing Our NEW 400 Cell EPA-Compliant Downpipes for the GEN3 B58 Platform\nThe Gen 2 B58 (B58N) turbocharged inline-6 is one of BMW’s most capable modern engines, known for its immense tuning potential and smooth power delivery. However, factory catalysts restrict exhaust flow and limit turbo efficiency. Our NEW EPA-compliant 400 cell high-flow catted downpipes are engineered to reduce backpressure, improve turbo spool characteristics, and unlock a deeper, more aggressive exhaust tone — all while maintaining emissions compliance standards.\nThis upgrade lays the foundation for increased performance on both stock and tuned vehicles.\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 restriction enhances responsiveness and mid-range torque.\n\nIncreased Tuning Headroom: Supports higher boost levels compared to restrictive factory catalysts.\n\nEnhanced Exhaust Character: Deeper tone with stronger turbo acoustics and sharper crackles.\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 withstand high exhaust temperatures and elevated boost pressure.\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 improved exhaust clarity.\n\nValvetronic Exhaust + Downpipes: Maximum transformation — enhanced crackles, sharper turbo spool acoustics, and a more aggressive overall signature.\n\n\nConstruction & Durability\n\nPremium high-grade s","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07806_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07812_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07817_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07845_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07836_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07839_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07819_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07821_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07828_ShopifyCustomSize.jpg?v=1784213543","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC07833_ShopifyCustomSize.jpg?v=1784213543"],"price":1999.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-07-16T16:00:45.309Z"},"share_url":"https://firestarter.network/l/lst_yr8hiboT","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_yr8hiboT' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy BMW GEN3 B58N 400 Cell Catted Downpipes' and a budget_max comfortably above $1999.99 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."]}}