I was also looking for a solution to tune an 08 G37. Was in contact with Visconti until he ghosted. I ended up just going with an UpRev tuner kit from Z1. I tuned my car myself, but I know that if I had any questions, they answer their phone, unlike Visconti. UpRev has been pretty stable for me so far, so no worries there, but I was just looking for something that would get my car to run clean - I wasn't looking for FFS, Launch control, etc., so that's not a factor to me. Either way, good luck! And if you DO find a solution, please post it, as I'm sure a lot of people would be very interested in what you find!
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