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As a side note it baffles me the material choices by some engineers. I’ve gone through five intake manifolds, plastic, on my 1996 Ford Thunderbird. If there was a direct swap aluminum one I would have bought it long time ago. It was a design choice undoubtedly based on cost, not longevity. So I do understand the opening posters concern. My Triumph seems to have whatever type OEM suspension on it and it’s a 2005. I don’t know if they are original or replaced, but I’m not making any plans to change them. They appear to be durable and good quality to satisfy my needs. Material changes are not always based on longevity, many times material changes in modern vehicles are by design meant to wear out. I had never heard of single torque bolts when I first started wrenching, now many manufacturers use them. I suppose they have some reasoning, weight perhaps or whatever. All I know is, some things have a limited life use. I don’t replace something without a good reason. Like the OP, if possible with something better and longer lasting. I’ll tackle that car manifold one more time, when I do it will be aluminum. Why now and not before, emissions testing. Now it’s 25 years old and here I can mod it without worrying that it won’t pass inspection. There is no emissions testing in Texas for cars older than 25, so I could change the top parts without worry. Hope you get the answers you want from the manufacturer, if not, stick with the OEM. Good luck if you decide to test them for a bit.