The Borla XR-1 Multi-Core is a compact racing muffler with a 2.5in inlet and 4in outlet on a 14in body, sized for both classic and late-model cars with ground-clearance constraints. The patented Multi-Core design pairs with high-temperature CFF acoustic packing to control sound without giving up horsepower or torque. T-304 stainless with 100% welded construction and a natural finish that can be polished.
| Type | XR-1 Multi-Core racing muffler |
| Inlet/Outlet | 2.5in inlet / 4in outlet |
| Body | 14in long body |
| Core | Patented Multi-Core |
| Material | T-304 stainless steel - 100% welded |
| Part Number | 401383 |
Shipping: In-stock orders placed before 3 PM EST ship the same day, and everything else ships within 24 hours. Standard, expedited, and overnight options are available at checkout. Backordered items ship as soon as we get them back in stock. Contact us for lead times. See the full Shipping Policy.
Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
