Have fitted scala rider with clamp to shoei multitec, fitted fine about 15 mins - mic is a bit awkward against your chin but soon got used to it - in hindsight a slimline velcro mic may be better - not sure if it's the same with c2 worth checking room between chin and front of lid. Linked into nav iii and linked iphone to nav iii - works great. Better half has same kit so we can talk rider pillion and pillion can link mp3 in through jack plug. Hope this helps!