That would be me back when I first started getting more and more into the performance side of things. I had alot of fun with that project.
I had 300cc Hybrids at the time if I remember correctly and I ended up putting the .84 turbine housings on some time after those vids. Tony Wildman was doing my tuning at the time and after sending my chip back and forth to him 20+ times so he could try different tunes to try and get them to spool he finally got one that worked.
The last time the truck was together and ran with those turbos was when Tony got me the rite tune. The turbo was extremely laggy still but when they did finally light all hell broke loose including the tranny.
I cannot say for sure what the boost got upto but the one glance I made was 30psi+. I am sure a little shot of nitrous would have made these things spool a whole lot quicker and I had the NOS kit in the shop but I never got around to trying it out.
After the one time the turbo did light the tranny pretty much exploded and the truck would not move anymore. So the truck sat at the shop for while waiting to get enuff cash together for a BTS. I ended up having a guy offer to buy the truck but he wanted it back stock. So I tore eveything off and put it back stock and slapped a cheap tranny in it. Then the azz hole back out on me and I made a few changes to it and pulled it a few times with a single charger before I tore it down to build the engine.
I still have some of the main parts laying around that I had custom made at a machine shop to mount the turbos. It is funny that I found this thread today as I have been doing alot of thinking this past week about trying something like this again but adding a third turbo.
But that is just thoughts and I have no clue what I will do....