These cars love to develop strange noises. Part of it is because the diesel engine puts out a lot of vibration and the sound travels in strange ways. If you have a component that is not entirely secured you will hear it and probably would not on a gas car. A side issue, I would recommend washing your engine bay so you can see if you have anything actively leaking which could become part of the diagnostic process.
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By a lot, i was trying to get up on ramps to put the exhaust on, and at full throttle i could barely make it up the ramps.
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When this happens, try switching into neutral and push the accelerator. Does the engine rev up? If not, you have a throttle or linkage issue. If it does, you have some other problem. Is your air filter clean?
I would not necessarily put these two issues together. Go back on whatever you have been wrenching on and see if you left anything loose. If that doesn't yield results, check each component under the hood for play with the engine off and see if you can manually re-create the vibration sound. Also try pushing the engine back and forth and verify it is fully seated in the motor mounts. Also check the tightness of the belts.
None of the belts or pulleys should have any effect on the engine performance.
I would say the turbocharger failing is probably the last thing to inspect. Have you made any adjustments to the ALDA?
Also, I would recommend doing an Italian tune-up at some point. Find a highway or somewhere you can drive at high speed for extended periods of time. It will do wonders to blow carbon out of the system.
Dkr.