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.
Specifications
| 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 |
| Fitment | Universal - high-horsepower applications |
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