A particulate trap has a plurality of filters and an air distributor. The air distributor has a first flow member and a second flow member. Each of the first and second flow members have a plurality of openings to allow exhaust flow through the plurality of filters. At least one of the first and second...http://www.google.es/patents/US7288137?utm_source=gb-gplus-sharePatente US7288137 - Particulate trap
