EBC can spool turbo up quicker by setting the gate preasue. which will only allow the waste gate to open at a set psi. A good manual valve will do the job though but as stated before turbo smart boost t's arnt much chop.
dude if your gonna be drivin a baby around in it dont bother. 3" from the turbz back is the way to go but thats gonna be too loud for a baby. back preasure and turbos dont mix so the 2.5" is a no go.
r32 actuator with no boost control solenoid = 10psi
r32 actuator with boost control solenoid hooked up normal = 10psi and at 4500 rpm 12psi
r32 actuator with boost control solenoid hooked up and earthed out = 12psi
possible coolant temp sensor if faulty it will send signal to ecu saying engine still cold causing overfueling when warmed up
have seen a couple on other makes of cars that where faulty but not bringing up a fault code.
hard to say withouy a data list on a scanner though.
oil pressuere will raise under acceleration or when the engine is idling high (like on start up) i think when idling when warm 33s will sit on about 4 and higher when cold. sounds like u have a flow problem.
you should get this checked out asap low oil preasure is a quick way to make your motor go boom!