{"type":"firestarter.listing","listing":{"id":"lst_4KwpzgHs","product_name":"Milltek Audi B7 S4 Catback Exhaust (Resonated)","category":"Catback Exhaust","description":"Milltek Sport exhausts are produced in high quality type-304 aircraft grade stainless steel. This material is anti-magnetic (other manufacturers' stainless steel may not be) and is less susceptible to discoloration. This quality of stainless steel is used on all pipework and the total construction of the silencer. Mandrel bending ensures full flow bends for better gas flow and Milltek systems are increased in bore to ensure ultimate performance without the loss of mid-range torque.\n\nAll Milltek exhausts are designed, developed and manufactured in-house in the UK.\n\n\n\nSpecs:\n\n\nPipe diameter: 2.25\" (57.15mm)\nResonated\n\nQuad 76.2mm Tailpipes\n\n \nFits:\nAudi B7 S4 4.2L V8\n\n\n","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SSXAU046_1.mob.jpg?v=1781889713"],"price":1776.2,"currency":"USD","in_stock":true,"inventory_qty":9999,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:19.957Z"},"share_url":"https://firestarter.network/l/lst_4KwpzgHs","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 <your Firestarter API key>","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_4KwpzgHs' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Milltek Audi B7 S4 Catback Exhaust (Resonated)' and a budget_max comfortably above $1776.20 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."]}}