chaps does anyone know who makes this chip? any information what horse is it good upto etc would be much help

You probably won't get an exact answer don't think it can be calculated from a parts list. As a guide the absolute maximum on stock turbos and injectors is 400 and a some. That's what noz (a bloody good dyno tuner on here) would get from it. But mine went from 330 to 430 with one remap. The difference between a jwt and a noz chip.

my mechanic is going to be replacing plenum/rocker cover gasket etc so may be more clued up about the injectors when he is in there. do you know anything the chip in the photo z32m.440? who mkes it etc? thanks

There are MANY MANY chips about for this car. It's likely you'll not be able to tell without taking the chip out and finding out what parameters are on it. But even then, there are so many copies of copies of modifications of copies, that who knows!

It just so happens ...... that I know that chip was one from SE Nissan. I don't have the exact spec, but it would have been one of the many developments that Pete (boss of SE Nissan) made. The 440 usually represents the power it made on the car for which it was developed. If it works well on your car then keep it. If you want something custom, then you'd best see Noz.