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 InstructionsThis Part Fits:
| Year |
Make |
Model |
Submodel |
| 2020-2021 |
Chevrolet |
Silverado 1500 |
Custom Trail Boss |
| 2019-2026 |
Chevrolet |
Silverado 1500 |
High Country |
| 2020-2026 |
Chevrolet |
Silverado 1500 |
LT Trail Boss |
| 2019-2026 |
Chevrolet |
Silverado 1500 |
LTZ |
| 2020-2026 |
Chevrolet |
Silverado 1500 |
RST |
| 2022-2026 |
Chevrolet |
Silverado 1500 |
ZR2 |
| 2019-2026 |
GMC |
Sierra 1500 |
AT4 |
| 2022-2026 |
GMC |
Sierra 1500 |
AT4X |
| 2019-2026 |
GMC |
Sierra 1500 |
Denali |
| 2022-2026 |
GMC |
Sierra 1500 |
Denali Ultimate |
| 2019-2026 |
GMC |
Sierra 1500 |
SLT |
⚠️ California Proposition 65 Warning:
This product may expose you to chemicals known to the State of California
to cause cancer or reproductive harm.
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