That is a picture with the suspension hanging. You need to measure it with it fully compressed.
It should be less then the static distance from the hub connection at the ZF that shows now.
You only need something like 2-1/2".
The original Ansa pipes I took off of the car were dimpled on one side for the axles. Just the one side. I don't remember which AND they were 2-1/4" pipes.
I'm skeptical of 4" but with that new kind of axle I doubt a 2-1/2" will have any issue.
Unless you were going for a race car, a 3" pipe only adds more noise to the exhaust.
2-1/2" is more manageable sound wise. 3" is going to sound like an open unmuffled exhaust.
Talking about unsprung weight? Look at the mass of that 1-1/4" vented brake rotor? That I do not understand considering the puny size of those motorcycle rear calipers? What's that about?
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