sr20det smoking once in a while after t28 install

[s13_sr20det]

okay heres the setup.
s13 blacktop with brand new s15 bb t28 stock 7psi
-4an oil restrictor
megan turbo elbow and manifold
3in exhaust piping
fmic
subaru sti yellow sidefeed injectors
z32 maf
safc2 (i know not the best thing to tune with. its temp til i get my cams and head work done then sending the ecu to get tuned)
mishimoto radiator
14in e fan


okay so the car idles fine and drives pretty strong. Holds boost with no problem and doesn't sputter at all. On cold starts the car doesn't smoke at all, but after driving the car for about 30min and coming to a stop it smokes like crazy for about 3min or so. Then it goes away. Its pretty thick white smoke. Also for some reason if the car is idling and if i remove the air filter it begins to smoke alot too. any input will help. thanks.