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.

This 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