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The AGM battery I installed previously measured approximately 13 volts.
I would have expected a new acid battery to be approximately 12.5 volts or higher. A 12.2v battery indicates around 50% charge.

Attempt to measure the voltages with the car's body as the ground reference; are they identical?

Remove the input pipe from the front of the engine and assess the impeller; I would wager it exhibits significant axial play.
Furthermore, if you remove the exhaust from the turbocharger, I suppose it will be significantly oily inside.

Turbo is the probable culprit, particularly if it is the N47 twin power turbo, which is known for its propensity to fail.

The connects2 kit preserves the original controls; however, I lost the steering wheel controls, albeit there are YouTube instructions available to assist in resolving this issue.

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Initially, an adapter is required, which is readily obtainable. This kit includes the wiring harness; I purchased mine separately for about £100. All that remains is to select your radio. Numerous tutorials on YouTube demonstrate how to modify it.

It will be authentic, akin to me!

It is designed to be inflexible, since it endures significant strain.

It consists of two steel components with a rubber core, serving as both a harmonic balancer and a pulley. I concur with the recommendation to get a pre-owned item.