Newbie here, got some question before purchase

[WWJD]

Hi, I'm very close to buying one, got some question, can anyone help me out? I know I can use search and I did. But just not so sure and I'm completely new to Z.

1. LSD. If I buy a 370Z without LSD, can I install an aftermarket one? I was told yes, but I couldn't find any info about it. I would prefer something like Queife that doesn't use clutch. This is important to me,if I can buy an aftermarket one then I'm not going to buy a brand new Z since I'm going to mod the car anyway.
2. Track preparation. Other than engine oil cooler, what do I need? In SoCal here, our track days in summer would be somewhere around 100F. Anything I should look for if Im planning to track it 5-7 times in a year?
3. Automatic tranny temp. Any problem with the tranny temp in hot days? Let's say running a 25 minutes session without cool down lap.
4. Carbin noise. How's the car bin noise in Z? I have a GTR, car bin noise driving me crazy, so I had to put Dynamat all around the car. Wonder if the Z has the same problem.
5. Exhaust drone. If I replace headers and front pipes with straight pipes, would I get drone? If so, how serious? What's the best way to go with the exhaust set up that quiet at low rpm, screaming at high rpm? I'm looking for a combo that less to no drone and loud at the same time.
6. Any special 370z model I should avoid?

Thanks everyone, looking forward to join Z family.

Ricky