I just don't don't think you will notice $600 of difference from a sloppy DISA valve(s).
I did notice a better motor response when mine were working correctly (fixed), but it is still fairly subtle, and only at certain RPM ranges.
I would test the small unit first before replacing, and or give the generics a test.
Of course this is a budget car for me. Your value of money may be different then mine lol. Best of luck!
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