hi ,just removed my egr ,97 300tdi auto ,put the kit on inc new hose ,took her for a drive, on low revs theres a strange humming sound just above tickover ,any ideas ??? apart from that she do seem to rev more freely ,de cat pipe on order and new lift pump ,thanks for any help ,

got an egr kit and hose sat here ready to go on, ordered a de cat pipe on the 30th , its still not here

cant wait to get them on, hope its as good as people say in improving revs and mpg