Well, there is still interest in these systems, but the pricing is pretty steep to play all the way at this level. We now are doing the manifolds as castings and as well the turbos are GTX with remote waste gates, then the engine build on top of all of that. Still, at the end of the day, it's well worth it. Still cheaper than buying an 800+ RWHP 911 turbo that runs on pump gas (maybe someone can show me one because I think to get to that power level you need to be on race gas or E85..perhaps not with a 991 basis for the build?). Right now I have two more systems to build, one is a hybrid (old+new stuff) and the 2nd is likely all new stuff. Plus two 16V cars to upgrade to modern hardware (in-house catch-up projects).
The owner now has this car back in Boston. All I can say is with it floor-boarded on 18 psig at the top of third gear, it's sort of frightening... to say the least. It's a real monster of a car. It's not a car I'd want to ride shotgun in, that's for sure. The "low power" setting on this car is 625-640 RWHP on 12 psig, and these are all straight pump gasoline numbers, no spray, no water-meth, no octane boosters, etc. Also, these are just massaged setting on the stock ECUs, no stand alone or anything fancy past a custom MAF setup to work with the LH 2.3. That power will be adequate to outrun most new performance cars. All in all it's a pretty efficient system, considering the age of the engine itself.
We're waiting on some Dynojet numbers on the car. I've found my machine tends to run 6-8 percent off (lower) of what a Dynojet reads. My local guy here with the Dynojet was tied up when I wanted to run the car on there. With all of that said, it should be able to post around 900 RWHP on the high boost setting. I have a couple of data points on other cars between my machine and Dynojet that confirm that 6-8% difference. It's moot anyway, the car is bloody insanely fast on the road regardless of the power numbers.
Best of all, the thing still has air conditioning and cruise control!
Here's a video:
https://www.youtube.com/watch?v=38TwqSXIvb0&t=725s