Arc went into bankrupcy early 2011 they were total JDM goodness simular to greddy and HKS.
they were predominantly famous for there very good quality intercoolers but also made other parts i.e BOV's and a few other aftermarket parts really was a shame to loose such a established player in the game.
but on the brightside any surviving ARC parts will become rarer as time goes by so become worth more pennies.
so hold on to em not just for the great build quality but because you wont see many of em about
hope this helps not really what you asked but might help