The Borla Pro-XS is a universal performance muffler with a 3in offset inlet and 3in offset outlet on a notched oval body. Notched necks allow easy clamp-on installation and the reversible design lets you mount it in either direction. T-304 stainless with high-temperature CFF acoustic packing for free-flowing sound control.
Specifications
| Type | Performance muffler (Pro-XS) |
| Inlet/Outlet | 3in inlet / 3in outlet |
| Configuration | Offset / Offset - notched (clamp-on) |
| Body | Oval |
| Material | T-304 stainless steel - 100% welded - natural mill finish |
| Design | Reversible - Free Flow with CFF acoustic packing |
| Part Number | 400491 |
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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