I see GM had their ZR2 Performance Exhaust systems on sale. GMC still lists them at full price.
www.shopchevyparts.com
www.shopchevyparts.com

2023 Sierra 1500 | Performance Cat-back Exhaust | Crew Cab | AT4X | 6.2L | Dual Rear Exit 19433388
Give your Sierra 1500 AT4X 62L engine performance and sound with this High Clearance Performance Catback Exhaust System from GMC For use on AT4X Short Wheel Base SWB Crew Cab Short Bed models this Catback Exhaust System utilizes Borlas patented racebred technology and engineering for an...

2023 Sierra 1500 | Performance Cat-back Exhaust | Crew Cab | AT4X | 6.2L | Dual Rear Exit 87816783
Give your Sierra 1500 AT4X 62L engine performance and sound with this High Clearance Performance Catback Exhaust System from GMC This Genuine GMC Accessories High Clearance Performance Exhaust is designed specifically for the Sierra 1500 AT4X with dual exhaust and Short Wheel Base SWB Crew Cab...