Well, I'll grant that EXP has a worse safety rating than cert. I've said that all along. There are ways to make the safety aspect tilt in my favor, and there are ways to make it worse.
If I had wanted to write a check for $60,000+ for something, I would have done just that. I'm not on the bleeding edge, nor even the leading edge of technology here. If I use conservative engineering principles, a well proven turbo, and do good workmanship, I think this will turn out fine. If it doesn't produce what I expect, I'm ready to change turbos, or plenums, or even change from blow through to draw through, or modify the exhaust as needed.
I take a serious view to safety, and don't plan to do much experimentation with strange things. The turbo and plenum I just bought is to test the exhaust fittings and see what kind of pressures I get, and follow the temps closely. The engine will be instrumented with 4 probe CHT, 4 probe EGT, TIT, 2 MP gauges in for comp outlet and intake/plenum pressures. In addition to the regular gauges. I'm going to be working out of a runway that's 9600' at 900' elevation with grass overruns on each end. Sure, it could end badly. That's the nature of 'experimental'. It's also why I'm on here asking questions and discussing things. Sadly, aside from a few cogent pieces of info, some of the commentary is pretty useless.