The IMSA 4C Harness to Stilo Helmet Coil Cord Adapter seamlessly connects IMSA configured communication wiring with wired Stilo helmets. An easy process, plug the white plug into the Stilo helmet comms jack, and the black plug into an IMSA style harness. Now you're ready to race with Stilo Wired Helmet and IMSA Radio Harness Compatibility.