Borla 22-23 Chevrolet Silverado 1500 ZR2 & AT4X 6.2L CC SB 147.5in WB S-Type True DualEXCEPT Vehicles With AEV Package. This Cat Back(tm) system features the classic Borla(r) S Type sound level and 2. 75" turn down tail pipes. It features a "True Dual" design which is unique in the industry. Installation requires cutting the factory Y Pipe. It was designed specifically for the Silverado 1500 ZR2 and Sierra 1500 AT4X and delivers great sound without any drone. Muffler contains an internal H Pipe for increased performance and improved