They may not be suitable for use on roads in some northern states of America
The Vespa T5 Horncast can be modified to fit the Vespa PX Models
Vespa 946 150 4T 3V ABS CD E4 2021 (NAFTA)
T5 Black Centre Stand (reinforced)
But luckily SIP have produced a cylinder head capable of producing the performance required when using the Malosssi Cylinder kit
Piaggio Vespa Starter Freewheel GTS, GTV 250-300 (2008-Onwards) Colour_Red They may not be suitablePiaggio Vespa Starter Freewheel GTS, GTV 250 300 (2008 Onwards) The starter freewheel joins the starter engine and crankshaft, enabling the engine to take over when it reaches the required speed. If a cracking sound is heard when starting, this component is likely damaged, and a breakdown of the engine housing can occur if left unresolved. Vespa GTS 250 (ZAPM45101), Vespa GTS 300 (ZAPM45200), Vespa GTS HPE 300 (ZAPMA3600, ZAPMD310), Vespa GTS Super