The Honda B-series engine uses a 'Donut' style exhaust manifold gasket which allows the flange at the front of the cat / decat to pivot without leaking. This is a replacement 2" version which is regularly found on the Honda B16a + D14 / D15 /D16 engines from 1992-2000 and many aftermarket exhaust manifolds.
* Please check the size you need as many B series cars have had parts changed over time and may not be still using the standard size of 2" (50.8mm) inside diameter.