Stilo long helmet adapter to go to NASCAR radio systems. Original Stilo to NASCAR helmet adapter for clear communication with your best friend on the track. This is an adapter for using Stilo helmets with Stilo integrated electronics to a radio system using a NASCAR car harness. This is Stilo to NASCAR Adapter Cable (4C to 3C) Details: Manufacturer: Stilo Manufacturer Part Number: AC0206 Coil Cable: Yes Stilo End: 4C (Short Stilo Connector, looks like IMSA, but is wired differently ) End of Car Harness: 3C (NASCAR) Length: Long