I have 109k on my engine it's an 01' gt motor with manual tranny. I get an annoying tapping noise that doesn't start until the engine warms up. As the engine begins to warm up the noise gets steadily louder until the engine is warm. The car does not make the noise when the engine is cold. The sound also goes away when I push the clutch pedal in. It sounds like the noise is coming from the transmission but my buddy said it sounds like it could be valve tapping. I'm at a loss to figure out what this is and any comments/ questions are appreciated.