The Borla XR-1 Multi-Core is a long-body racing muffler with a 3in center inlet and 3in center outlet on a 6.25in round body (16in body, 21in overall). Its patented Multi-Core 4-tube design flows better than straight tubing for maximum horsepower and torque, and the long body suits SUV and truck builds. T-304 stainless with CFF packing, a reversible design and no logo embossment.
Specifications
| Type | XR-1 Multi-Core racing muffler |
| Inlet/Outlet | 3in inlet / 3in outlet |
| Configuration | Center / Center |
| Body | Round - 6.25in diameter - 16in body - 21in overall |
| Core | Patented Multi-Core 4-tube |
| Material | T-304 stainless steel - 100% welded - no embossment |
| Part Number | 400373 |
Shipping
- In-stock orders placed before 3 PM EST ship the same day — everything else ships within 24 hours.
- Standard, expedited, and overnight options at checkout.
- Oversized items ship by freight and take longer.
- Backordered items ship as soon as stock lands — contact us for lead times.
- International orders: prices do not include VAT, duties, or import fees. Your country charges these at import and they are the buyer’s responsibility.
Returns
- 30-day returns on new, uninstalled items in original packaging with all hardware.
- Standard returns: 8% restocking fee, buyer pays return shipping. Both waived if the item is defective or we made the error.
- Installed or used parts can’t be returned — confirm fitment before you install.
- Special orders and custom items are final sale.
- Email us for return authorization before shipping anything back.
Full details: Shipping Policy · Refund Policy
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