Stilo helmets have the best earmuff / speaker combination on the market. There are many Peltor intercoms out there and this short piece of wiring allows the two to join together.
Approximately 40cm long, 4 pin plug on both ends. The orientation does not matter on this adapter as both ends are the same. There will be some volume loss on one side, this can't be avoided as the Stilo and Peltor helmets have different electronics.
Please note this is for the Stilo WRC model, NOT a Trophy model. Please research the Stilo website if you are unsure what you own.
Peltor amplifier to Stilo WRC helmet