{"type":"firestarter.listing","listing":{"id":"lst_kAo29yNd","product_name":"Soul Performance Porsche 718 GT4 RS / Spyder RS SOUL Valved Exhaust System","category":"Exhaust","description":"Unlock the True Potential of Your GT4 RS\nWhile the factory rear muffler on the standard 718 GT4 wasn’t a major restriction, reusing it on the high-performance GT4 RS has created a bottleneck for the GT3-derived engine. The original tubing diameter—less than 2¼ inches—remains unchanged, restricting the increased power output. Although this design helps meet sound regulations and simplifies manufacturing, it doesn’t maximize the performance capabilities of the GT4 RS.\nOur Valved Exhaust system changes the game by utilizing full 3-inch oval tubing, perfectly engineered to fit within the tight confines of the rear chassis. With a focus on performance and sound quality, we’ve designed the secondary flowpath as a Helmholtz chamber to effectively reduce drone, ensuring a smooth and enjoyable driving experience. Coupled with our Valve Controller Kit, you can maintain optimal sound and performance throughout the rev range, unleashing the raw, unmistakable tone of the flat-six engine as you push it to its limits.\nFitment Note: Due to the system’s advanced anti-drone design, it is not compatible with factory Over Axle Pipes. It must be installed alongside any of our Over Axle Pipes or other compatible aftermarket alternatives to ensure proper fitment and optimal performance.\nExhaust Tip Selection: For those looking to maintain the factory appearance, this system can be used with OEM exhaust tips. However, please note that the OEM tips feature a much smaller diameter inlet, requiring the system to be necked down, which introduces a restriction and reduces overall performance. To extract the most from your GT4 RS, we strongly recommend selecting our high-performance exhaust tips, designed to complement the full 3-inch system without any compromises.\n\n\n\n\n\n\n\n\n","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-2-1.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-4-1.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-6.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-7.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-8.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-Build.webp?v=1772051202","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Valved-Exhaust-Installed.webp?v=1772051202"],"price":5995,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:21.439Z"},"share_url":"https://firestarter.network/l/lst_kAo29yNd","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_kAo29yNd' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Soul Performance Porsche 718 GT4 RS / Spyder RS SOUL Valved Exhaust System' and a budget_max comfortably above $5995.00 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."]}}