I choose Arai Signet for comfort, weigh and shape of my head.

It's expensive one, but when you ride 8 to 10 hours a day, it worth.

The Arai are always very well pack and the quality is super.

I removed the speakers and mic from my new Nolan and start 'destroying' this new Signet.

The whole job took about 2 hours for 2 helmets.

I removed the ear padding's and the visor.

The first time you remove a visor on an Arai is not easy, but you will get used to it.

Almost looks like you will break it. Follow the instructions on the manufacture manual and you will be fine.

The chin foam is the most scare to remove.

Note that there is 3 double face adhesives that must be carefully unclue in order to remove the chin.

Use a plastic spoon to gently force the unclue

The pic didn't came up good, but try and you will see the 2 vertical adhesives on the sides, and one horizontal on top/middle.

Ain to those and gently force it out from the shell until you removed complete.

There is noting else attaching/attached to the chin besides de adhesive, so you will not damage anything else.

Mark the mic position with a pencil and start carving the foam

DO NOT use a hot wire to burn the foam It will make the foam became hard as a rock.

I used a cirurgical knife

I didn't cut the leather on the front of the chin. I just puncture it so the sound could pass thru.

Note that I also carved a path for the wire, going to the left side of the chin,

this is the front side.

I didn't cut it, but the sound goes just fine.