There is a 94-96 q45 in a yard near me that I'm going to try and get but what year did the vvti end?

If I got a tune would it really make a difference if I had it or not? and where would I get a tune that is good..

VH45DE engines from 1989-1995 had VTC (Valve Timing Control). The 1996 Q45 didn't have it, as it had to comply with OBD-II. Easiest way to tell the difference is by checking which type of OBD connector the car has, 12 pin (Nissan Consult 1) or the 16 pin OBDII. From what I understand, most people don't really notice the difference with or without VTC. The only thing that sucks about the 1996 Q45 is the certain parts are not interchangeable with the older models.