{"type":"firestarter.listing","listing":{"id":"lst_hzsimMk5","product_name":"Valvetronic Designs Audi TTRS MK3 Valved Sport Exhaust System","category":"Cat Backs","description":"\nAudi TTRS (Mk3) Valved Cat-Back Exhaust System\n3\" T304 Stainless Steel with OEM-Style Electronic Valve Control\n\nOverview\nThe five-cylinder soundtrack is iconic—the factory cat-back just keeps it on too short a leash. The Valvetronic Designs Valved Cat-Back for the Mk3 TTRS increases system diameter to 3 inches for significantly improved flow and a sharper, more characterful note without sacrificing daily comfort.\nAt the heart of the design is our rear Y-section: straight-through when valves are open for maximum presence, and routed through a quad-chamber center muffler when closed for quiet, refined cruising. The dream exhaust for Audi’s modern 5-cylinder is here.\n\nWhy It Works\n\n\n3\" Free-Flow Architecture: Reduces back pressure and unlocks response through the rev range.\n\n\nDual-Path Rear Y-Section: Straight-through (open) or muffled (closed) for two distinct personalities.\n\n\nSystem Tuning as a Whole: Designed as a cohesive cat-back for consistent tone and perfect fit.\n\n\n\nSound & Control\n\n\nValves Open: Uninterrupted flow to the tips—crisp, aggressive 5-cylinder character.\n\n\nValves Closed: Gas passes through the quad-chamber center muffler—significantly reduced volume, highway-friendly.\n\n\nOEM Integration: Uses OEM-style electronically actuated valves; compatible with OEM Audi valve control.\n\n\n\nConstruction & Quality\n\n\nMaterial: T304 stainless steel throughout.\n\n\nCraftsmanship: Precision TIG welds and fully mandrel-bent tubing.\n\n\nWeight Savings: 14.8 lb lighter than the factory exhaust.\n\n\nFinish & Tips: Premium tips engineered to complement the TTRS rear bumper.\n\n\n\nFitment\n\n\n2017–2020 Audi TTRS (Mk3 / 8S)\n\n\n\nInstallation Notes\n\n\nDirect bolt-on cat-back; no permanent modifications required.\n\n\n100% reversible—return to stock at any time.\n\n\n\nWhat’s Included\n\n\n3\" T304 stainless steel valved cat-back system\n\n\nQuad-chamber center muffler\n\n\nOEM-style electronic valves\n\n\nAll required clamps and hardware\n\n\n\nSpecifications\n\n\nTubing Diameter: 3\" from front to rear\n\n\n","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/AUD.MK3.TI_Primary.webp?v=1781117534","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03700_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03721_Shopify_Custom_Size.webp?v=1781117581","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03727_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03731_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03741_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03756_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03763_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03767_Shopify_Custom_Size.webp?v=1781117581","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03778_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03784-2_Shopify_Custom_Size.webp?v=1781117581","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03790-2_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03795_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03815_Shopify_Custom_Size.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/DSC03834_Shopify_Custom_Size.webp?v=1781117581","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/image_560736fc-6337-443b-8f57-333441fb83c3.webp?v=1781117580","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/image_dcbcdcc7-9319-47dc-983d-edc70370f7d5.webp?v=1781117581"],"price":2499.99,"currency":"USD","in_stock":true,"inventory_qty":19998,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:20.054Z"},"share_url":"https://firestarter.network/l/lst_hzsimMk5","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_hzsimMk5' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Valvetronic Designs Audi TTRS MK3 Valved Sport Exhaust System' and a budget_max comfortably above $2499.99 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."]}}