1967-69 Chevy Camaro, 1968-74 Nova LS Swap Long Tube Headers 4:1 Stepped Long-Tube Header Silver Ceramic Coated Primary Tube Diameter: 1-3/4" to 1-7/8" Primary Tube Gauge: 16 Gauge Collector Attachment: Slip-Fit with Band Clamps Collector Diameter: 3" Flange Thickness: 3/8" Bolts and/or Studs Included Gaskets Included Adapters/Reducers Included