For Chevy GM LS1 LS2 LS6 Block Hugger Ceramic Coated Headers Street 100% brand new,high performance ,professionally tigged welds Ceramic coated Desigh for Ceramic coated exhaust headers for GM LS1 LS2 LS6 engines. w/ 1-5/8 tube and 2-1/2" collector 3/8" thick machined head flanges for perfect sealing surface.