When i rev about 4000 rpm on my 1st gear, it sounds like there is something loose spinning (noise sounds like a loose screw spinning around in some sort of circular motion).. The car is brand new and only does this in 1st gear.. Does anyone have a clue what's wrong?

 

I'm going to go out on a limb and say it's not normal. Acceleration or deceleration only or steady speed also? Any recent work on the car? Without any additional info I have to go with your diagnosis: There is a loose screw spinning around in a circular motion.

 

it happens during acceleration and deceleration. no work to the car, it's only 2 days old.

 

Take it back to the dealer. More than likely it's the throwout bearing and you just can't hear it in the higher gears because of road noise. Try this: With engine running, transmission in neutral, and the clutch pushed in, can you hear the noise? Then, let the clutch out. Can you hear it now? That would be the throwout bearing. These cars have a history with very noisy throwout bearings. If you still can't hear it until you engage first and let out the clutch, definitely take it to the dealer.

 

i noticed a noise only after i took my car to the track w/ 500mi on it and since i have the lsd in the back, every time i launched it would hop and it f-ed up my 1st gear syncro and now evey time its in 1st it sounds like a bearing spinning very fast almost like a whistle.

 

that is exactly what mine sounds like.. i am going to the dealership tommorrow and find out what is wrong with my car.