boost not holding at full please help!!!!
 

ok guys so ive had my sti for a year know and finally decided to do basic mods its a 2005 sti usdm model
i did agency power headers
full turbo back
aps intake
and a up pipe
i also have a access port which just installed less than a month ago

know the car was running great had great power and a nice quick back to it

my problem know is ive been noticing a little bit of a lag and not hitting full boost so i cleared the computer and everything was fine again but know the other day i went to turn on the car and noticed a bit of smoke come out it was almost as oh damn is that me ?? i was lost so i shut the car off and turned it back on and it didnt do it again know this morning i was on the highway on my way to work and there was a truck coming at me really fast as if he wasnt going to stop luckly i noticed and so i down shifted and got on it a little so i can pass the car next to me and get over one lane and i noticed the car hit full boost and go back down to 8 or 10 psi and i was like wtf ??.... i have no cel and the car is not idling funny or anything know i dont know what to do im going to check the compression and was just wondering if this ever happend to any one and plus the car has low milage its got 64k on it know please help thanks guys

your car needs mapping for the mods

As above.SJ.