I'm not sure about Arai but my friend crashed on the track a few years back with a custom painted Shoie. He sent it in to get checked and they told him it was not safe anymore....he's like fine, just send it back so he can have a little memento of his highspeed Bridgehampton crash......Shoei was like sorry...we destroyed the helmet.
BTW - if you need a new lid check out the deal on the WERA board
http://forums.13x.com/showthread.php?t=105492
njracer