Features Header Type: Turbo Inlet / Outlet: 1.76" / 2.89" V-band Clamp size:3.0" (Allowable Error range:0.1-0.2inch) Primary Diameter: 1-7/8 in. (48mm) Collector Diameter: 3 in. (76mm) Head Flange Thickness：3/8 in. (9.5mm) Pipe Thickness: 16 gauge (1.5mm) Fitment 1998-2013 Chevrolet Camaro 1998-2013 Chevrolet Corvette 2004-2013 Cadillac CTS 1998-2002 Pontiac Firebird 2004-2006 Pontiac GTO Designed for LS based small block V8 engines(LS1, LS2, LS3, LS6, LSX) Can be used for single or twin-turbo builds Up and forward facing 5.7L 6.0L 6.2L