EXCEPT ZR2 & AT4X models. This extension pipe is used to adapt the BORLA® 147.4" Wheelbase Cat-Back™ systems to fit Crew Cab with Standard Bed (6' 7") 157" Wheelbase vehicles. The extension pipe dimensions are 3.5" ID inlet, 3.5" OD outlet, 12" long. Includes 1) 3" clamp. Built from premium, high-quality austenitic T-304 stainless steel, to give you the absolute best in performance and durability. Precision computer numerical control (CNC) manufacturing ensures an accurate fit. Best of all, BORLA® stands behind every extension pipe 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
2019-2023	Chevrolet	Silverado 1500	High Country
2020-2023	Chevrolet	Silverado 1500	LT Trail Boss
2019-2023	Chevrolet	Silverado 1500	LTZ
2020-2023	Chevrolet	Silverado 1500	RST
2019,2022-2023	GMC	Sierra 1500	AT4
2019-2023	GMC	Sierra 1500	Denali
2019-2023	GMC	Sierra 1500	SLT