I have one on a HJC Sy-Max 2 helmet. I had to order an extra long boom because it needed to be mounted further back on the rim of the helmet but it works fine. I tried to find the "long boom" on their web site but don't see it so you might need to call them. And by the way, my older HJC Sy-Max helmet worked fine with the standard length boom that came with the Scala Rider Q2 unit.
No additional foam at all. I just stuck them on the inside of the helmet between the helmet foam and the shell at the opening for your ear. On the new Sy-Max 2 I needed to pull (unglue) about a 1/4 of the foam away from the helmet to mount the boom but that's all. Again, on my older Sy-Max didn't require the long boom or any other modification.
I might add I've been very pleased with the Q2. I use it with my Zumo 550, listen to FM and MP3's and can take cell calls and the caller doesn't know I'm on the bike if I'm going less than 45mph. Please know I don't make a habit of using my cell while riding but it's there if you want it.
I'm trying to get my wife (DRZ 400SM) to do some more riding with me, and I'm thinking if we had a way to communicate during the ride we can do more rides together. She does ride a lot alone but mostly short stuff, the Scala should help.
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