I found an a actuator for my w124 that comes with changeable springs for pressure. Does anyone know if they are any good?

Do you mean are the changeable springs any good?

I have not read about changeable springs.

I thought the spring tension was adjustable and if that dose not work people usually put a boost controller in the boost pressure line to keep the Waste Gate from opening at too low of a pressure.

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84 300D, 82 Volvo 244Gl Diesel

See attached pic

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84 300D, 82 Volvo 244Gl Diesel

Both federal and CA versions have an adjustable spring.
If you’re lookin for more boost, just get an MBC.

More importantly, how are you gonna get more fuel for said boost?

I am not wanting more boost. I did find and order a Garrett 480009-6 actuator.

This is for my w124, not w123.