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I also have a 2008 G37S, and I'm about to order the same kit. Looking forward to continued results. I have an auto and so I'll need a few supporting mods in that department, but it sure sounds like it's a go. Thanks for the post.
Regarding the Synchronic BOV: I had a Synchronic on my Subaru STI and after changing and futzing with settings, it worked PERFECTLY. Yes, there are a few adjustments, and you DO need to plumb back into the intake, especially with the MAF. It is quieter if you do so, too. (For me: A good thing. Others: Not so important)
The low throttle response was immediate and gave
zero flutter, which I couldn't lose with the TIAL. I'd be giving those a try once again. Glad to know the TIALS are OK, though.
Don't know anything about the other brand.
Jim