[sambo]

Hi Peter. Yarra Valley Exhaust in Lilydale made the headers. 1.75" primaries, 2.25" secondary pipes and 3" collectors with Holden flanges. Holden use the same exhaust flange for 3" and smaller pipes diameters which is handy. They also fitted bungs for O2 sensors on the top of the collectors, same as the factory position. I'll get high temp coating after the dyno tune, which will be after rego.