Borla 2019 Chevrolet Silverado / GMC Sierra 1500 S Type Catback Exhaust - 2.75in Pipe DiameterBorla 2019 Chevrolet Silverado GMC Sierra 1500 S Type Catback Exhaust 2. 75in Pipe Diameter EXCEPT ZR2 & AT4X models. Factory Split Rear Exit vehicles ONLY. Tips NOT included, reuse factory tips. This Cat Back(tm) system by BORLA(r) features a "True Dual" design which is unique in the industry. Installation requires cutting the factory Y Pipe. The system has the famous BORLA(r) "S Type" sound level. The muffler contains and internal H Pipe for