Honda B/D Series Donut Gasket 18229-SH3-X30

Honda B / D Series OEM Exhaust Donut Gasket

If your car has that annoying tick on cold start or you keep smelling exhaust in the cabin, don’t ignore the simple stuff. The Genuine Honda exhaust donut gasket, part number 18229-SH3-X30, is the OEM Honda exhaust gasket that seals two exhaust sections where they need a little flex. That donut shape lets the joint move without blowing out the seal, so you get less leak noise, less vibration, and fewer mystery fumes.

This Honda B/D Series exhaust gasket fits 50 to 64mm inner diameter piping, which covers a lot of factory setups and plenty of lightly modified systems. You’ll see it used as the Honda header to catalytic gasket, also called a Honda catalytic converter gasket, and it can show up at the midpipe and axleback connection. In plain terms, it helps keep the exhaust aligned when the engine rocks and the system heats up.

Honda spec’d this exhaust seal on a bunch of classics, including the 1988 to 2001 Acura Integra, 1995 to 2005 NSX, 1988-1995 Honda Civic, 1988-1991 Honda CRX, 1993-1997 Honda Del Sol, and 1995-1998 Honda Odyssey. We still use these exact OEM Honda exhaust gasket parts on our own cars because aftermarket donuts can fit loose, crack early, or need constant retightening.

Key Features

• Genuine Honda exhaust donut gasket, also known as an OEM Honda exhaust gasket
• OEM Honda part number and SKU OHA-18229-SH3-X30
• Fits 50 to 64mm inner diameter exhaust piping
• Donut style seal allows controlled movement, helps prevent leaks and rattles
• Commonly used as a Honda header to catalytic gasket, Honda catalytic converter gasket, or Honda exhaust donut gasket joint
• Often used at the midpipe to axleback connection, think Honda midpipe exhaust gasket location
• Built for high heat and real exhaust conditions, not just garage starts

Vehicle Compatibility

• 1988 to 2001 Acura Integra
• 1995 to 2005 Acura NSX
• 1988 to 1995 Honda Civic
• 1988 to 1991 Honda CRX
• 1993 to 1997 Honda Del Sol
• 1995 to 1998 Honda Odyssey