On the Sheoi-Qwest..... Have to cut(with X-acto) the inner-ear molded plastic into the shape of speakers -- there is a space molded into the plastic for speakers, but the J&M are larger in diameter, and need a little trim. Then carefully and with X-acto, trim the foam material out in the same shape down to the shell membrane. Next, you have to cut our the "peanut" shape of the Mic INTO THE chin bar-- the area is a molded dense foam about 1/4' thick and covered with a vinyl material -- us some pry-bar (popsicle stick) to lift the foam away from helmet shell to get the mic seat into and under the foam.
The Arai -RQ takes the same work but the ear pieces are not as clearly defined.
All-in all..... I tried to do the "pry" step on the chin bar before any cutting and did not feel comfortable. Risking $900 worth of helmets to save $140 when done by experts who do it day-in, day-out.....would be a bad choice.
So, I will send the helmets on Monday