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I have the Blistein HDs with the M030 on my Cabriolet. Its a firm ride not overly harsh but for the city driving that I do I probably should have gotten the M033. I heard its a little softer to give better ride when road gets rough.
Took a quick look at the catalog.
The M030 has a stiffer sway bar and stiffer springs and the normal USA ride height.
The M033 is a Non-USA lowered option with different springs and dampers.
I went through an analysis and found the the HR Kit with their matched progressive springs was the best value in a high quality slightly lowered solution where the stock alignment values can be used.
See attached for my notes. I have not verified all the info in the attached.
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