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

Your claim is unsupported, and I suspect incorrect.

Ok, so, you think the factory didn't do finite element analysis? Of course they did. I mean, they did it long hand and with no where near the granularity that is done now, but how do you think they figured out to put spot welds say every ~2" instead of every 4"? Or what gauge of metal to use for frame rails vs K frames vs floor panels? Yes, the factory did the math.

And XV claimed they used a "million dollar program" to run the FEA on their K frame and suspension parts. Maybe that's not entirely accurate, but, they said they did FEA. None of the other suspension manufacturers for these cars have even made the claim, and I imagine if they'd done anything even marginally close to FEA they'd use it as a marking point. No reason not to.

So no, my claim isn't unsupported. XV's claim of FEA is in the article and ad, and the factory did it, because they engineered the whole damn car.

Does the qualifier "to be heavily reverse loaded at high cyclic rates." mean anything to you? Please educate me, exactly how many welded cast alum pieces made up the XV IFS system?

No, because welded aluminum is in fact used in modern subframes by the MILLIONS. And the XV K-frame was extruded tubing welding together, not cast, but if anything extruded aluminum makes for better welds than cast.

BMW's use welded aluminum K-frames. Here's a 2015-2020 M4 K frame, links included in case you want to look at even bigger pictures â 15-20 OEM BMW F80 F82 M2 M3 M4 Front Axle Support Suspension Subframe K-Frame | eBay
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Here's a rear subframe for a 2010-2012 750 10-12 BMW 750 F02 REAR SUBFRAME SUB FRAME CROSSMEMBER CRADLE OEM GENUINE | eBay
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Needless to say, welded aluminum isn't a problem for K frames or suspension pieces as long as it's properly engineered.

I clearly stated "if I remember correctly" from an event that took place 14+ years ago online and what you seem to be focused on is one article, there is development history with XV products that predated the later article you hold so dear and logic would support that maybe a quickly fabricated beefier Alum rad crossmember to fortify a discovered insufficient OEM steel crossmember was fabricated to test its improvements is a normal design path, I believe a pic of that protype in alum is what I remember seeing, that obviously never made it into production in alum and was later built out of steel shown in your beloved article.. I suspect this possible timeline does not fit your bent on building a case to inaccurately belittle me, and that is fine, the source of the disrespect has already gained a well-earned reputation from my viewpoint a

Seems like everything you said here is unsupported. Your memory has already been shown to be fairly inaccurate, so, let's see this prototype aluminum lower radiator support.