The Borla muffler / resonator is made for the 2019+ Chevrolet Silverado 1500 with the 6.2L engine and has a 3.5-inch diameter. It replaces the Polyphonic Harmonizer behind the primary muffler in the ATAK cat-back system to give the S-Type sound level, which is quieter than ATAK.

Part number: 60679

Borla muffler.

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®). Designed to provide maximum flow & power. Precision computer numerical control (CNC) manufacturing ensures an accurate fit. Just what you’d expect from the world’s most experienced (and most winning) exhaust brand.

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