{"type":"firestarter.listing","listing":{"id":"lst__ZP21tMP","product_name":"Soul Performance Porsche 718 GT4 RS / Spyder RS SOUL Race Exhaust System (Resonated)","category":"Exhaust","description":"The factory rear muffler wasn’t much of a restriction on the standard 718 GT4, but reusing it for the GT4 RS has created a bottleneck for the GT3-derived engine. The tubing diameter remains the same, meaning that increased power is now forced through tubing that measures less than 2 ¼ inches. Repurposing that muffler helps meet sound restrictions and eases manufacturing processes, but doesn’t extract the most performance out of the GT4 RS.\nOur Race Exhaust system measures a full 3 inches from the flanges to our tips, unleashing every bit of character from the 4.0-liter flat-six. The bespoke x-pipe creates a crisp motorsports tone, and our Resonated version tackles the drone under 2500 RPM using resonators and anti-drone tubes.\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.\nDETAILS:+  Weighs 6.5 lbs / 2.9 kg less than factory exhaust components (27.5 lbs vs 34 lb factory)+  All SOUL Performance Products exhaust components are backed by the industry’s first and finest Lifetime Warranty for both street and track use+  Designed and built in-house at our Willow Grove, PA facility\nDescription\nDEVELOPMENT: The factory rear muffler wasn’t much of a restriction on the standard 718 GT4, but reusing it for the GT4 RS has created a bottleneck for the GT3-derived engine. The tubing diameter remains the same, meaning that increased power is now forced through tubing that measures less than 2 ¼ inches. Repurposing that muffler helps meet sound restrictions and eases manufacturing processes, but doesn’t extract the most performance out of the GT4 RS.\nOur ","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Resonated-Race-Exhaust-2.webp?v=1772047909","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Resonated-Race-Exhaust-1.webp?v=1772047933","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Exhaust-Comparison-scaled.webp?v=1772047933","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Resonated-Race-Exhaust-3.webp?v=1772047884","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Resonated-Race-Exhaust-4.webp?v=1772047884","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/SOUL-Performance-Products-718-GT4-RS-Resonated-Race-Exhaust-Build.webp?v=1772047884","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/Stock-vs.-Race-Exhaust-System.webp?v=1772047884"],"price":3595,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:21.457Z"},"share_url":"https://firestarter.network/l/lst__ZP21tMP","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__ZP21tMP' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy Soul Performance Porsche 718 GT4 RS / Spyder RS SOUL Race Exhaust System (Resonated)' and a budget_max comfortably above $3595.00 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."]}}