Replace the small muffler behind the primary muffler in the BORLA S-Type system with Polyphonic Harmonizer 60680 to attain the ATAK sound level (louder than S-Type). BORLA'S Polyphonic Harmonizer Technology utilizes patented units that contain pipes of different diameters and lengths to create multiple exhaust notes that harmonize to deliver a clean, rich, full-bodied sound to the BORLA mufflers. The mufflers then enhance this sound to the character and volume appropriate for our Touring, S-Type and ATAK systems. Built from premium T-304 stainless steel, superior to T-400 series (such as 409), to give you the absolute best in performance and durability. Ultra-smooth mandrel bends ensure maximum flow & power, and precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA stands behind every Polyphonic Harmonizer with a Million-Mile Warranty. Just what you'd expect from the world's most experienced (and most winning) exhaust brand.
Installation Instructions
This Part Fits:
Installation Instructions
This Part Fits:
| Year | Make | Model | Submodel |
|---|---|---|---|
| 2019-2023 | Chevrolet | Silverado 1500 | Custom |
| 2019-2023 | Chevrolet | Silverado 1500 | Custom Trail Boss |
| 2019-2023 | Chevrolet | Silverado 1500 | High Country |
| 2019-2023 | Chevrolet | Silverado 1500 | LT |
| 2019-2023 | Chevrolet | Silverado 1500 | LT Trail Boss |
| 2019-2023 | Chevrolet | Silverado 1500 | LTZ |
| 2023 | Chevrolet | Silverado 1500 | PPV |
| 2019-2023 | Chevrolet | Silverado 1500 | RST |
| 2019-2021 | Chevrolet | Silverado 1500 | SSV |
| 2019-2023 | Chevrolet | Silverado 1500 | WT |
| 2022-2023 | Chevrolet | Silverado 1500 | ZR2 |
| 2022 | Chevrolet | Silverado 1500 LTD | Custom |
| 2022 | Chevrolet | Silverado 1500 LTD | Custom Trail Boss |
| 2022 | Chevrolet | Silverado 1500 LTD | High Country |
| 2022 | Chevrolet | Silverado 1500 LTD | LT |
| 2022 | Chevrolet | Silverado 1500 LTD | LT Trail Boss |
| 2022 | Chevrolet | Silverado 1500 LTD | LTZ |
| 2022 | Chevrolet | Silverado 1500 LTD | RST |
| 2022 | Chevrolet | Silverado 1500 LTD | SSV |
| 2022 | Chevrolet | Silverado 1500 LTD | WT |
| 2019-2023 | GMC | Sierra 1500 | AT4 |
| 2022-2023 | GMC | Sierra 1500 | AT4X |
| 2019-2021 | GMC | Sierra 1500 | Base |
| 2019-2023 | GMC | Sierra 1500 | Denali |
| 2022-2023 | GMC | Sierra 1500 | Denali Ultimate |
| 2019-2023 | GMC | Sierra 1500 | Elevation |
| 2022-2023 | GMC | Sierra 1500 | Pro |
| 2019-2023 | GMC | Sierra 1500 | SLE |
| 2019-2023 | GMC | Sierra 1500 | SLT |
| 2022 | GMC | Sierra 1500 Limited | AT4 |
| 2022 | GMC | Sierra 1500 Limited | Denali |
| 2022 | GMC | Sierra 1500 Limited | Elevation |
| 2022 | GMC | Sierra 1500 Limited | Pro |
| 2022 | GMC | Sierra 1500 Limited | SLE |
| 2022 | GMC | Sierra 1500 Limited | SLT |