{"type":"firestarter.listing","listing":{"id":"lst_IRI9EhUD","product_name":"JXB Performance Driveshaft Center Support Bearing Carrier Upgrade - Audi 4L Q7 (7L8 521 102 H/K/L)","category":"Driveshaft Carrier","description":"The stock center support bearing carrier holds the driveshaft in place with a layer of thin rubber. While that’s great for making sure no NVH makes it to the cabin, it doesn’t keep the bearing centered well under load, allows the bearing to sag and ruin driveshaft alignment over time, and creates slop in the driveline during shifts and throttle application.\nOver time the OEM bushing becomes brittle, eventually dry rotting and cracking. Even on the best-kept cars, the stock bushing can start to form cracks in as little as 5-10 years.\nWhen the bushing wears and sags, it changes the alignment of the driveshaft, putting more stress on the joints. During rapid loading of the driveshaft (launches, shifts, and quick application of the throttle), the bearing is allowed to travel off-center, introducing slack in the driveline, which results in laggy and unpredictable driveline response.\nOur upgraded driveshaft carriers keep the driveshaft firmly in place at all times. The more solid bushings ensure the bearing cannot move from center, maintaining torque delivery and driveshaft alignment at all times, resulting in more direct driveline response under all conditions.\nBenefits as described by our customers include:\n\n\nMore direct throttle response\n\n\nFirmer, more direct shifts\n\n\nMore instantaneous launches\n\n\nReduction in vibration due to driveshaft misalignment and/or rubber deterioration\n\n\nSmoother low-speed on/off throttle behavior (1st gear in parking lots)\n\n\nBenefits as described by our customers include:\n\n\nMore direct throttle response\n\n\nFirmer, more direct shifts\n\n\nMore instantaneous launches\n\n\nReduction in vibration due to driveshaft misalignment and/or rubber deterioration\n\n\nSmoother low-speed on/off throttle behavior (1st gear in parking lots)\n\n\n\n\nReduces drivetrain slop\n\n\nRestores and maintains driveshaft alignment\n\n\nInstalls without having to remove or disassemble the driveshaft\n\n\n \nStreet vs. Track\nStreet and Track refer to the durometer (stiffness) of the bushings. T","images":["https://cdn.shopify.com/s/files/1/0024/4898/2060/files/Screenshot_2026-02-05_115135.jpg?v=1770310357","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/Screenshot_2026-02-05_115207.jpg?v=1770310357","https://cdn.shopify.com/s/files/1/0024/4898/2060/files/Worn_Carrier_1_9ea4f316-5f67-470e-808d-6ae338ace8e8.webp?v=1770310357"],"price":299.99,"currency":"USD","in_stock":true,"inventory_qty":29997,"dynamic_pricing":false,"listed_at":"2026-06-20T14:56:22.289Z"},"share_url":"https://firestarter.network/l/lst_IRI9EhUD","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_IRI9EhUD' — this pins the purchase to this exact listing, skipping product search — plus request: 'Buy JXB Performance Driveshaft Center Support Bearing Carrier Upgrade - Audi 4L Q7 (7L8 521 102 H/K/L)' and a budget_max comfortably above $299.99 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."]}}