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Actually if you have complete r32 gtr front clip it's going to help a lot.
I have seen an A31 Cefiro with full rb26 r32 gtr awd drivetrain swapped in and running well. An A31 Cefiro has identical front suspension to an s13, so is quite possible to do.
Things I remember about how to do the swap :
Remove/cut the strut tower from s13, cut the strut tower from the r32 gtr front clip, weld the r32 gtr strut tower to s13 chassis.
Swap the front suspension of r32 gtr to the s13.
Notch the frame rail of the s chassis for the front axles to pass through to the wheel hubs, refer to the r32 frame rail for this.
For sitting the rb26, you can swap in the engine mountings from the r32 gtr front clip to the s chassis.
The front diff of r32 gtr is 4,11:1 ratio, make sure you have the same ratio in the rear diff. Better yet, swap in the complete subframe assy of the r32gtr to the s13, if you get it with the front clip.
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