Has anyone tried or successfully installed an intercom into the Bell Sport Mag Helmet? I ask because I'm looking at this helmet for a Rallyx where SA approval is required but I don't stage rally (yet). My thinking is if I can add an intercom to the helmet later it will be a reasonable investment I can build on later as I build my skills (and bank account). Or is it better to look at a Peltor or Stilo that's for sure going to work but will be significantly more upfront. I can justify a 250-300 investment now but 600-900 for a Stilo/Peltor seems a bit steep at this point.