2014-2018 CHEVROLET/GMC Silverado/Sierra 1500 6.2L Automatic/Manual Trans. Ext. Cab Standard Bed (78.7) Crew Cab Short Bed (69.3) 143.5 Wheel Base. Specification Product Type Cat-Back&trade Exhaust Pipe Diameter 3.5 into muffler dual 2.25 out Tip Size Tip Description Tip 4 Exit Truck Single Split Rear Exit Vehicle(s) shown may vary from your specific model. Note Products are shipped un-polished unless otherwise indicated. Image shown may be a polished version. Tip style may vary.