The Remus connection tube for 2019 and newer Vespa GTS/GTS Super 300 HPE includes an integrated catalytic converter and is intended to replace the factory connecting pipe. As a direct replacement part, it routes exhaust between header and muffler while retaining emissions control via the built-in catalytic converter, providing a like-for-like exhaust connection for the specified Vespa models.
Remus 2019+ Vespa GTS/GTS Super 300 HPE Black Connection Tube w/Catalytic Converter