cold are piping question

[86 wh1 t-type]

i have a 86 t type runs 10.30s it has a precision 67hpq turbo with 4 inch inlet,my piping reduces to 3" to clear the throttle body intake pipe.also running a k&n filter behind bumper,my ? is if i took my intake pipe off and left turbo opening open or just removed filter,you think it would help performance any?what are u guys with low10 sec,cars useing for cold side intake,it runs a sd chip so no maf
thanks

 

[GW2]

Removing the filter wouldn't help enough to notice, and removing the intake pipe you'd need to stick the maf right on the turbo (unless you're using a speed density chip). You could run the intake to one of the high beams for a shorter run but remember the air is travelling through all the intercooler piping as well. I don't think the reduced intake length would help that much.