I haven't, but I'm going to ;-)
As a matter of fact I have ordered the relocation kit from
www.summitracing.com it's part number TRD-1113 . It's less than half of the cost of the Greddy unit.
Although on the web page it doesn't show the MKIV supra as an aplication when I called their tech support number the tech told me that it is the correct size and thread pitch.
I'll try to keep everyone posted when I receive and install it.
HTH,
Chad H.