I've been looking into getting a g37 coupe for a while now and am currently saving the money to do so, so take my questions with a grain of salt as I don't even own the car yet. But after looking at all the mods and such I'm going to want to put on eventually, I've inevitably looked at boosting it. As of right now I'm expecting it to cost 10k+ minimum for a good tt kit that'll get me around 500ish hp. So my question is what would have to be done to get more? I know I couldn't just get a stage 4 turbo kit and expect to actually get 1000hp because I'd just trash the engine, so what would have to be done and at what point? Can the stock motor even handle 500hp? At what point do I have to replace the clutch/transmission? At what point is the price to performance gain become too diminishing to make it worth it? What does it even mean to get forged internals? What else should I upgrade besides air, fuel, electronics, blow motor, those kind of things? If this kind of information is already somewhere else please point me in the right direction, I want to make sure I know what I'm getting into and make sure I've done as much research as possible before hand. (I should also say I don't plan on getting the car and instantly boosting it, I know I need to fix the car if there's any problems with it first and I'm not going to have the money to do so because I just bought it)

 

Man, you've got a lot going on. But, in regards to the G37 and boosting it:

-make sure to get the 6MT. I'd even make sure to get the S model with the LSD rear diff. The 7AT does not like boost hitting at low revs.
-Budget at least $20K. I say this because you have no idea what you are doing (no offense) and you will rely on a shop(s) to take your money. Whether or not they do you right is a coin toss. Heck, $20K may not be enough if you get the wrong shop.

The G37 is a good platform. Before anyone says it isn't, the Lexus RC350, the closest competitor to a G37, has far less support. Of course a Mustang would be better. But, if you must have a Japanese coupe, you've only 2 choices, G37/Q60 or Lexus RC350.

As for all of your other questions, they are basic to any car being modded and have been discussed ad nauseam on here many times.