Exhaust Pipe Flange Gasket (61554) by Fel-Pro®. Position: Rear. Location: Catalytic Converter. If you need durable gaskets to prevent leaks on your vehicle, Fel-Pro is the way to go. Engineered using the latest technologies and global engineering resources, the gaskets meet specific OEM needs and provide superior sealing performance and durability needed to withstand the unique characteristics of the application.