Originally Posted by ThoriumHotdog

I saw your post the other day but didn't feel qualified to answer your questions. I'll try to help anyway. This is all based on what I've read here so don't hold me to it.

If you're going to start with a base model and build it to track you're definitely going to want a brake upgrade. Rotors, calipers, brake pads and definitely brake lines and a high quality brake fluid. If you have an automatic you might want a transmission fluid cooler as well.

The majority of the cabin noise seems to come from the actual tires on the car. Some members have reported drastic changes once they put on different tires. If you dynamat the Z like you have the GTR you should be fine.

There are a lot of reviews and videos on exhausts. I haven't really read too many threads complaining about drone but it all depends on the exhaust you get. I can only suggest browsing the reviews and asking members what they think.