KA24DE down pipe measurement for 1997 240sx

[Kouki_2.4]

Sup all. Currently, i have a 4-2-1 header + Tanabe exhaust system. I'm thinking of swapping out my aftermarket header and replacing it with an OEM exhaust manifold. I was able to get my hands on one, however, the guy who i got it from did not have the piping that goes from the end of the OEM exhaust manifold to the exhaust itself. Does anyone know the measurement of that pipe? If so, it would be much appreciated!