The Borla ATAK axle-back system replaces the factory mufflers and rear piping with 2.75 in mandrel-bent T-304 stainless tubing and two race-inspired ATAK mufflers, delivering Borla's most aggressive sound level. Acoustically-Tuned Applied Kinetics tuning shapes the muffler cores for a hard exterior tone while keeping the cabin free of harsh resonance. It finishes in a pair of 4.5 in polished stainless round rolled, angle-cut tips and installs as a direct bolt-on using factory hardware.
Specifications
| Type | ATAK axle-back exhaust (aggressive sound) |
| Position | Rear (replaces mufflers and rear piping) |
| Pipe Diameter | 2.75 in |
| Material | T-304 stainless steel |
| Tips | Two 4.5 in round rolled, angle-cut |
| Finish | Polished stainless |
| Sound Level | ATAK (most aggressive) |
| Warranty | Borla Million-Mile Warranty |
| Part Number | 11799 |
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2011-2012 | Ford | Mustang | Shelby GT500 |
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
