Perf Now Cubefield If The Motor Is Modified In My Car And I Need To Put A New Computer In Do I Need To Get A High Perf. One?

If the motor is modified in my car and I need to put a new computer in do I need to get a high perf. one? - perf now cubefield

My engine has been modified or even genetically in the cylinders, which are actually changed in a Nissan. BTW My car is a 1991 Pontiac Sunbird 2.0 OHC. My team must be replaced, but I wonder who is always how it was when) I replace it, because I think it's really thinking is a new engine (replacement and does not know what you put more fuel needed is.