where do i start.

how do i describe it, a raspy kind of noise coming from the front of the car, also when i'm driving you can here the turbo whistling very loud and not perforing very good, i had a ten minute drive home from work, drove steady, opened my bonnet and the manifold was glowing bright orange.
my exhaust is knocking slightly, was wondering if this could be anything to do with it, maybe blowing slightly?

i'm ment to be off down regal tomorrow but don't wanna spend loads of money if it buggered