gday bobby, before i say anything just want to say im a big fan of your approach to building your car and think its tops that youve comitted to building something different - and i hope it all turns out great.
1 question - in terms of not only cost, but also time, power and least disruption to exhaust flow would it have been a 'better' option to either
a) externally gate the wastegates pipes
b) if for road legal purposes, create a completely separate secondary smaller exhaust for the wastegates OR if using the same exhaust - join the wastegate pipes and main exhaust system further down i.e.: just before the cat (if there is one)
as opposed to creating the venturi...
dont get me wrong, i love what youve done think its f**kin great but just a question that crossed my mind when reading this - cheers