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I just went three this on my 08 G35S Sedan which is essentially a G37.
I searched Internet forums high and low trying everything I read and everything pointed to the grommet under the windshield.
After weeks and weeks of trying things i finally figured out what it was.
On the firewall, on the inside of the car there is a plastic grommet with a nipple on it that the passenger side sunroof drain connects to. In my situation the grommet lost it's seal against the firewall and was dripping down under the glove box. I ended up making sure it was completely dry and like a ninja, put silicon on my finger while looking threw the vent caked it on and so far so good 2 months later.
There's 2 ways you can try to figure it out. I poured really hot water down the sunroof drain, which caused condensation to form on the windshield from the steam from where it was leaking.
You can also pull the passenger side air vent out of the dash and with a flash light slightly see the nipple, you may able to see the drip while you pour water down the sunroof drain.
I'm not sure how much you have looked into things, but if yours is anything like mine it took me weeks to figure it out. I suggest you pull the passenger side carpet back in the mean time. Under the carpet they have styrofoam as sound deadening and the floor actually has a dip in it and can hold 6L of water.. Mine was full in heavy rain storms.
Hope that helps, and if you have any more questions let me know.
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