Long Tube Manifold Headers for Chevy Camaro Pontiac Firebird Trans Am (1998-2002)LS1 FBody 5.7LHigh Flow Long Tube Headers for 1998 2002 Chevrolet Camaro & Pontiac Firebird What it does: Replaces the restrictive factory cast iron exhaust manifolds with high flow long tube headers to significantly increase exhaust scavenging and engine volumetric efficiency on LS1 powered F Bodies. The Stock F Body Exhaust Bottleneck The factory cast iron exhaust manifolds on the 1998 2002 LS1 F Body are designed for emissions compliance and tight packaging