No idea.. Not measured it and it is tapered but the customer cuts them down to size.....

Been testing a new material which is still a development formulation. I had to make some air box parts for a customer but I got to make a velocity stack from the stuff to test and its very good.. Just out of the mould with no lacquer it has stunning clarity. I only had scraps to use for the velocity stacks so this is made with those scraps.