DOES THE HDK SUSPENSION K-MEMBER HANDLE BETTER THAN A T-BAR SUSPENSION?

DionR said

You must be assuming they were selling kits. They were selling cars and I would expect that generally they wouldn’t spend money on something they didn’t need.

They had the data, they could have even fudged them or lied and said the lower radiator support wasn’t needed and saved some money on the builds. But they didn’t.

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If it wasn't needed, and they didn't include it, what was the "sizzle" left to market beyond undisclosed multi post data?

The front lower radiator support was if I remember correctly a welded alum member. That is very big no no design wise if it is critical and to be heavily reverse loaded at high cyclic rates.
However, if your goal is to make a sale and just get it out the door, it matters little.