[island911]

I would be glad to hear HOW any metalurgical techniques, for these items, have improved in the last 30 years. One hellava lot was known about metalurgy 30+ years ago.

I suppose that the question maybe, has the price of high-end alloys (Inconel, ect) come down enough in price 30 years later?

I don't know what material(s) Porsche used for the OE t-bars, so hard to say if something 'better' is being offered.

At the end of the day, it's just a spring. Between the different common alloys, the physical parameters change little. The cost differences, though . . . yikes.

fwiw, I designed/sized a torsion spring, yesterday, for a medical-device arm. Tho' only ~14 ft-lbs @ 90°.