Long Tube Headers with Y-Pipe for 4.8L 5.3L 6.0L Vortec

The Flashark Long Tube Headers and Y-Pipe kit is engineered to replace the restrictive stock cast manifolds found on 1999-2006 Chevy Silverado, GMC Sierra, and Chevy Avalanche 1500 models equipped with 4.8L, 5.3L, or 6.0L Vortec V8 engines. This stainless steel header system features a long tube design that enhances exhaust scavenging compared to stock manifolds or shorty headers, aiming to improve throttle response and mid-range power. The kit is constructed using TIG welds and CNC flanges for durability and a precise fit. It addresses common issues such as the "Chevy tick" caused by warped or cracked manifolds, and offers a deeper, more aggressive V8 exhaust note. The package includes a pair of long tube headers, a matching 3-inch Y-pipe, gaskets, and necessary hardware. Installation is a direct bolt-on for 2WD models. However, it is important to note that 4WD / 4x4 models may require Y-pipe modification, such as cutting and welding, due to potential interference with the front driveshaft. Additionally, if using a 4L80E transmission, bellhousing clearance should be checked, and O2 sensor extensions might be needed due to the repositioned sensor locations. When paired with supporting modifications like an upgraded intake and a proper tune, these long tube headers are estimated to provide gains of 20-25+ horsepower. While the truck may feel sharper without a tune, it is strongly recommended to optimize fuel trims, prevent check engine light issues, and unlock the full performance potential.