Stilo Helmet Adapter AC0224 is the long cable that connects your Stilo helmet to an IMSA Radio Systems. Genuine Stilo to IMSA helmet adapter for clear communication with your best friend at the track. This is a longer cable adapter for using Stilo helmets with a vehicle wired for IMSA (4C four conductor). Both ends look the same as Stilo and IMSA use the same international 4C IMSA protocol.
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