Replace the Polyphonic Harmonizer behind the primary muffler in the BORLA® ATAK® system with muffler 60679 to attain the S-Type sound level (quieter than ATAK®). Built from premium T-304 stainless steel, superior to T-400 series knockoffs (such as 409), to give you the absolute best in performance and durability. Designed to provide maximum flow & power. Precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA® stands behind every direct fit muffler 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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Price Match Guarantee:
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Fitment Guarantee:
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Avoid the headache of the wrong part. If you are unsure about compatibility, contact us first. If we verify the fitment for your vehicle via email and it doesn’t fit, we will handle the exchange at no cost to you.
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Every product we sell carries its full original manufacturer’s warranty. While warranties are serviced by the brands themselves, we act as your advocate handling technical details to ensure your claim is processed fairly.
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Leveraging our massive supply chain, we secure hard-to-find components that other shops can't access. Whether it's a standard upgrade or a custom exotic application, we have the network to get it to your door.
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support@autohousesupply.com
Our experts will review your specifications and provide written confirmation for your build.
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At AutoHouse Supply, we are enthusiasts first. Our goal is to provide a seamless logistical experience so you can focus on your build. Please see our standard guidelines below.
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Secure Shipping:
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We offer FREE Ground Shipping within the 48 contiguous United States. Most in stock orders process within 48 hours. For your security, high value performance parts require a signature upon delivery to ensure they reach you safely.
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Please inspect your order immediately. Damage must be reported within 48 hours. For freight/LTL items, if you cannot inspect the contents immediately, please write "Subject to Inspection" on the delivery receipt before signing.
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Unused items in brand new, original packaging can be returned within 30 days. While standard refunds incur a 25% restocking fee, we will waive this fee entirely if you choose store credit or an exchange for your next upgrade.
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Exclusions:
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To ensure every customer receives brand new, untampered components, parts that have been installed, modified, or used are non returnable. Custom builds, special orders, and wheel/tire packages are considered final sale.
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Need assistance? Reach out via our
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Fitment Guarantee
Fitment guides and tools are helpful, but your car is unique! Some trims and options aren’t always listed, so if you want 100% confidence that a part will fit, our team is happy to double check for you. We take the guesswork out of your purchase by standing behind our expertise.
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Verify Your Build:
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If this product doesn't list your specific vehicle data, simply reach out to support@autohousesupply.com. We will manually verify compatibility for you.
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Our Promise:
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When we confirm a fitment in writing and it doesn’t work for your application, we cover the return shipping and exchange it at no cost to you.
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