No. no other mods were done. And yes, he told me that it was done purely for an increase in performance. There were no problems with the vehicle. Was told that his intention at the time was to keep the car; and that this was the first of many things he had on his list. Next was the cold air intake, then a free flow exhaust maybe including headers. He told me he read a performance article explaining this injector mod as an increase in performance. So what i am hearing hear from first reply is that this increase in fuel needs to be offset with an increase in air. Is this correct? Cold air intake; k & n filter, etc.