GT555

Hi !
I have reduced the hole (diameter) of the bolt in the "T" hose on the turbo (i made a new one on the turning lathe).
From original 1.2mm to 1.1mm, now the car accelerate a little bit better (more aggressive).
My question, is it bad for the car to reduce the hole ?
Because first i had reduced it to 0.9mm diameter and the car has permanent cut off the engine in higher gears and rev.
But when reduce it only 0.1mm the car is more aggressive and there is no engine cut.

Does anyone know ?

Thanks

GT555