I know there wont be a ton of market for this on the 370 board but I see quite a few G's here too. I am moving on to other hobbies and selling my car so I never used this. There are tons of positive reviews on YouTube on this shift kit for G35's/G37, 350z's, Titans, etc etc to make the shift points much more crisp and sporty.. I got several quotes from shops ranging from $250 - $500 for the install. If you are a DIY'er type this can definitely be done at home with some jack stands, 10mm, 12mm sockets and some time. I ordered it brand new from Summit for $268 about a year ago and only opened it to look at. Here's the link to it on their website if you'd like to know more. I'm asking $250 shipped.
https://www.summitracing.com/parts/trg-re5ro5a-hd2
Thanks.