Ordered some of that dynamat/akasa noise dampening material a couple weeks ago from Crazy PC and finally got a chance to fight w/ it. Wicked sticky stuff! But it covered the poor stacker's lame grayness and got rid of the directionally variable high frequency whine from the raptors for about $10 so I'm pumped! I think the next step from here will be to paint the exterior. I'm thinking yellow w/ black stripes.