{"type":"firestarter.listing","listing":{"id":"lst_H9JyCFe9","product_name":"Porsche Cayenne Turbo S/GT/GTS 400 Cell Catted Downpipes","category":"Motor Vehicle Exhaust","description":"Porsche Cayenne Turbo S / GT / GTS – EPA-Compliant 400 Cell Catted Downpipes\nPrecision Engineered for the 4.0L Twin-Turbo V8 • High-Flow Performance • \n\nIntroducing Our NEW 400 Cell EPA-Compliant Downpipes for Cayenne\nThe Porsche Cayenne Turbo 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.\nDesigned specifically for the Cayenne Turbo S, Turbo GT, and GTS, these downpipes elevate the driving experience while preserving the precision Porsche is known for.\n\nWhy 400 Cell?\n\n\nEPA-Compliant 400 Cell High-Flow Catalysts: Increased exhaust efficiency while maintaining compliance standards.\n\nImproved Turbo Response: Reduced backpressure sharpens throttle input and mid-range delivery.\n\nRefined Yet Aggressive Sound: Deeper tone with enhanced clarity at higher RPM.\n\nMaintained Daily Comfort: Performance gains without sacrificing drivability.\n\n\nEngineering & Performance\n\n\nOptimized Flow Design: Reduces restriction while preserving catalyst efficiency.\n\nMandrel-Bent Tubing: Smooth internal transitions for consistent exhaust velocity.\n\nPrecision TIG Welding: Built to endure high temperatures and sustained boost pressure.\n\nDirect OEM Bolt-On Installation: Utilizes factory mounting locations.\nEngineered to Pair with Valvetronic Exhaust Systems\n\n\nSound Profile\n\n\nStock Exhaust + Downpipes: Noticeable increase in depth and presence without overwhelming cabin refinement.\n\nValvetronic Exhaust + Downpipes: Sharper response, increased volume, and a more motorsport-inspired character while retaining Porsche composure.\n\n\nConstruction & Durability\n\nPremium high-grade stainless-steel construction\nHigh-temperature resistant 400 cell catalyst cores\nOEM-style sensor place","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08120_ShopifyCustomSize_aa7ee0bd-e575-4c26-84f0-7644b78fe9d6.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08148_ShopifyCustomSize_aed5a9e7-6c2c-4a34-ab04-56368a43951f.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/edited_square_hero_Shopify_Custom_Size_5658662a-9cd6-4465-adc5-7c0c2978f772.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08143_ShopifyCustomSize_98b30de6-7bdb-444d-abfd-4a4bd3d47ac8.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08180_ShopifyCustomSize_81b3c792-74e6-4340-bfee-ae38bef1d9fe.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08123_ShopifyCustomSize_5580710b-0181-47a8-b0be-ac872770455a.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08132_ShopifyCustomSize_7465665e-d6cc-4978-b3b0-96a4db4cab00.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08152_ShopifyCustomSize_2985a8e2-ed68-4489-9c0e-ba4148550342.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08173_ShopifyCustomSize_a9819de6-7ddd-46f5-bb25-fb9641b87e10.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08125_ShopifyCustomSize_0bd75178-9cf9-48a8-a04d-8a290c9384f5.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08136_ShopifyCustomSize_482fdd06-1da2-4558-81a6-416186f5acf3.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08128_ShopifyCustomSize_c6119209-b428-4815-810c-e416fe597fa5.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08139_ShopifyCustomSize_934b610a-c25d-4319-80d5-c65a80467ffd.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08177_ShopifyCustomSize_68e39a40-b68b-4496-a361-d7aa0824a62f.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08186_ShopifyCustomSize_bb0ff288-23a1-4f07-b8e1-f64671f8971f.jpg?v=1784213593","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC08115_ShopifyCustomSize_41986dc7-cca0-4785-95ba-f22d4595bde0.jpg?v=1784213593"],"price":3999.99,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-07-16T16:00:45.255Z"},"share_url":"https://firestarter.network/l/lst_H9JyCFe9","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_H9JyCFe9' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Porsche Cayenne Turbo S/GT/GTS 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."]}}