Here's the deal. My car sounds like shit right now. I hear a noise coming from under my hood. It sounds like the pistons? It's real loud. Almost a clicking, and it get's louder and faster with more gas. Is this an exhaust leak? Also when I'm at idle after my engine warms up I can hear a whistleing. And when I put the clutch in, the whistleing stops. Any help will be greatly appreciated!