Whats this noise?
 

I don't know where to put this, but here's the downlow. I got a built up 350 swapped in my car right now, and its good for about 350hp, 400lbs/ft. When I used to downshift to 3rd gear at a 50mph roll, I was able to chirp the tires, but now when I do it, I hear kindofa light crackling noise. I also hear it when the RPMs get past 3000. Whats wrong with my car? Does anyone else have this problem?

oh no!
 

is your noise comming from your rear end? could be u joints or a tranny mount ...or bad rear from all the hard down shifting ?