Long Tube Headers for 1999-2006 Chevy GMC Silverado Sierra 4.8L 5.3L 6.0L 1-7/8". 
 
Fits 99-06 Chevy/GMC trucks and SUV (2WD & 4WD) 4.8L, 5.3L, 6.0L
 
Full length design for power gain from mid to high RPM range
Long transition collector for decreased back pressure
Fully mandrel bent tubes made of 16-gauge 304 stainless steel
Head flanges laser-cut from 3/8-inch thick steel plates
Flanges flattened by hydraulic press for precise and leak-free seal
Flanges chrome plated for corrosion resistance