Primary Tube Diameter - 41.28mm (1-5/8”).
Collector Diameter - 63.5mm (2-1/2”).
Exhaust Ports - Round 42.4mm x 42.4mm (1-43/64” x 1-43/64”).
Dimensions:
Width of Header at Widest Point from Exhaust Port - 104.9mm (4-1/8”).
Height of Header from Top of Flange to Lowest Point - 311.15mm (12-1/4”).