Please help!!!! I need help!!!!!!!

Hi,
I just turbo my da i have a jdm b16 on it. I steel dont have the map sensor check valve… The thing is that every time i rev my engine at about 3k rpm and shit the gear… i hear the blow off valve, and a small amount of white smoke comes out of my exhaust, but is only when i shit gear at about 3k rpm and when i drive it normally does not do that. Please tell me what is wrong, or if is normal
Please let me know… I need help!!!

thanx