B SERIES EXHAUST MANIFOLD DONUT GASKET 2"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)