coming from my transmission when i push in my clutch?

it's sooo loud when car is cold, never stops making that noise when warm now.

is this the same issue with the first '03 350z's that came out?

 

Whatever it is, nobody else is having it: you have a problem with your car. Take it to the dealership for troubleshooting/repair.

 

Do a search in the maintenance and repair forum for clutch noise. You'll find many, many threads detailing different noises. Maybe one of the threads will describe what you're hearing.

Also, just a fyi- the 350z (nismo or not) have loud clutches/tranny/flywheels. If you're really freaked out by it, just go to the dealer and have them crank one up for you on the lot. Push the clutch in and see if it makes the same sound. Good luck.

 

mine's a nismo, number 708. this noise is getting worse - noticeabe first when it started getting cold in january.

 

I understand it's a Nismo. Go to the dealer and crank up another car so you'll be able to sleep better at night.