LS1 Camaro & Firebird Longtube Headers & Y-Pipe (1 7/8" Race Version) F-Body Mandrel Bent Tubing, CNC Machined Flanges Race Version with "NO" AIR/EGR Fittings, 304 Polished Stainless Steel 1 7/8" Primaries, Standard Graphite Manifold Gaskets 3" Collector Gains over 25rwhp