1. They are the same but you need to wire up a new plug wich is piss easy.
2. I got mine for $250 but they do go from $250-$350 from what i have seen.
3. Once you max out the RB20det AFM it's hard to tune it so bring on the Z32 that is all.
4. Yes of the twin turbo one.
Wiring for Z32 Maf into GTS-T
Z32 terminals are lettered A Thru to F, total of six terminals of which 5 are used on the Z32 and 4 on the GTS-t.
Working from A upwards as follows:
A: do not use
B: connect to Black wire on GTS-T MAF loom
C: connect to black/silver
D: connect to white
E: connect to black with white tracer
F: do not use.
Use a VL AFM plug if you don't get one with the Z32 coz it's the same.