I installed a egr delete kit this weekend on a customers 03 6.0. The truck starts fine,egt's are the same as before, boost numbers are the same as before. But driving down the road if he gets on it you can hear what sounds like air sucking ?? Hinda like air is being sucked througha restrictlive air filter.I have told him three times that if it was a boost leak he would have LOWER boost and HIGHER egt's. But he is saying the noise was not there before and it is now there so something is wrong:bs:. I am goign to spary everything down with soapy water to check for leaks but is there anything else to look for. The truck is stock other than a AFE air filter and a edge programmer.