thermal dp question

i just wanted to know why my car smokes a little without a dp connected. i was reading the turbo teg project you have going and you said you ran the car without having a dp. was your car hesitating at all or have a little bit of smoke come out of the turbine? do you think the smoke could be caused by the o2 sensor being left in the open since there is no dp? if so what should i do about o2 sensor? im about ready to have a custom 3 inch dp made from a local speed shop here. im new here and just wanted to know if you guys can help me out. thanks



97 honda accord coupe ex sohc vtec stock internals 145 hp
2nd gen drag turbo kit, except i have new turbo manifold by sfp
( fmu setup)
3 inch exhaust at least from the cat back