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Right, flow should not be equal across the intake and exhaust valves. However, keep in mind that the cylinder head was designed for a n/a engine. The turbo has obvious benefit of pressure across the valves too. To figure out the ideal exhaust flow one needs to start with the max boost...

Trans output shaft? CV Joints? You could do visuals on the axle boots. Maybe pull out the drive shaft and check for play in the output shaft. When I've had driveline vibrations in the past it shook the entire car. The fact that you're feeling it in the -um- gear selecter lever leads me...

You can isolate somewhat by checking to see if it happens in neutral. Speed related is almost always driveline, but what you're describing sounds like a lash issue.

I assume the idea here is to have a "legal" JDM car? One that you can register and buy insurance for. I don't care much for legality, but ethics do apply. The FMVSS were ostensibly created to protect the consumer, so anybody that drove a JDM car would not be afforded such wonderful...