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All suspension worth buying will be "corrosion proof". My SAABs and my Alfa Romeo have ordinary steel shocks and last well over 200,000 km and, so far 22 years and 17 years without corrosion damage and driven year round.
Stainless steel has many disadvantages, the primary one being cost.
Ordinary painted steel shocks last a long time even in severe winter conditions. I have never had to replace a shock which failed because it was rusty.
Springs cannot be made from corrosion proof metal and usually fail long before corrosion can damage any shock fitted to the same wheel.
Shocks wear out long before corrosion can become relevant.
So, no, I disagree. I say that paying for stainless steel shocks is a complete waste of money practically speaking. KW is indulging in pure marketing bling and no doubt charging for the "bling" that remains unseen behind the tires. No question KW makes a good product.
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