Borla's ATAK is the loudest of its street cat-back systems, running 3.5 in pipe into dual 2.75 in tail pipes in mandrel bent T-304 stainless steel. In place of a rear muffler it uses Borla's Polyphonic Harmonizer, which layers pipes of differing diameters and lengths to build volume without cabin drone, and that harmonizer can be swapped for muffler 60679 to drop the system to S-Type volume. A valve simulator on the Y-pipe accepts the factory exhaust valve actuator so no check engine light is set. Each tail pipe carries dual 3.5 in round carbon fiber tips with black anodized centers, and installation requires removing the factory valance tips.
| Type | Cat-back exhaust system (Borla ATAK) |
| Sound Level | ATAK |
| Material | T-304 stainless steel, mandrel bent |
| Pipe Diameter | 3.5 in into dual 2.75 in tail pipes |
| Tips | Dual 3.5 in round carbon fiber with black anodized centers per tail pipe, 4 total |
| Exit | Split rear. Factory split rear exit vehicles only |
| Valve Simulator | Included on the Y-pipe, accepts the factory exhaust valve actuator |
| Fitment Notes | Excludes ZR2 and AT4X. Adapter 60706 required for Crew Cab with standard bed, 157 in wheelbase. Installation requires removal of the factory valance tips |
| Pairs With | Muffler 60679 for S-Type sound level, Polyphonic Harmonizer assembly 60680 |
| Emissions | 50 state emissions legal. Factory catalytic converters and emissions hardware untouched |
| Quantity | 1 kit |
| Part Number | 140997CFBA |
| Warranty | Borla Million Mile Warranty on the system. Carbon fiber and tip finishes covered 1 year |
Documents: Installation Instructions (PDF)
This part fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2024-2026 | Chevrolet | Silverado 1500 | High Country |
| 2024-2026 | Chevrolet | Silverado 1500 | LT Trail Boss |
| 2024-2026 | Chevrolet | Silverado 1500 | LTZ |
| 2024-2026 | Chevrolet | Silverado 1500 | RST |
| 2024-2026 | GMC | Sierra 1500 | AT4 |
| 2024-2026 | GMC | Sierra 1500 | Denali |
| 2024-2026 | GMC | Sierra 1500 | Denali Ultimate |
| 2024-2026 | GMC | Sierra 1500 | SLT |
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Returns: 30-day returns on new, unused items in original packaging. See the full Refund Policy.
