Type: Long Tube Exhaust Headers. Vehicle type：Fit for 1999-2006 Chevy/GMC/GMT/ Silverado/ Sierra 1500 SUV (2WD/4WD) 4.8L/5.3L/6L. (4WD may require trimming to install). We included a Y-shaped tube which designed to allow the exhaust gasses to flow more freely from each cylinder and combine in a more efficient manner.
eBay