They seem to be like Adel Wiggins clamps which have been replicated a lot!!! They get very pricey with all the fab work involved but they are worth it IMO. We did some on a 1000hp supra at the shop I was working at, but with two turbos and lots of piping it would be very expensive on a TTZ. They seal with an oring that can be easily sourced so they will last forever and they seal great while allowing a little bit of flex as well (you need to account for the flex while building the piping or you will hit parts in the engine bay or suspension).
IMSA 300zx had this as well!!!
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