The most important question to get answered is whether the Intermediate Shaft Bearing (IMS) was replaced. If so, when was this done (miles ago) and was the new bearing the LN Engineering designed bearing. If the IMS fails, you'll be looking at $$$ to replace the engine.
The OEM litronics are really expensive. Most likely you would need to have other parts added have them auto level, i.e., angle sensors in the front and back, and calibrated afterward by a Porsche dealer. And that assumes the wiring for the angle sensors is already in place.
Hope this helps
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