How much do 944T brakes move the wheel out?
 

I understand that the 944 brake conversion when done on a balljoint front suspension and the IRS rear will widen the track.

How much does the track width increase?

It depends on several factors.

Usin steel trailing arms at rear you will have a 25mm increase perside, add an inch perside if you also use hte Aluminium trailing arms.

The front varies as there are quite a few different methods using early or late style hubs. I think mine was increased by no more than 10mm with bearing adapters, but I haven't measured.

Rich