ok so, first ill say it only happens when the engine is cold (hasnt been driven in a 10+ hours, our temps have been like 10-25 degrees celcius here) but after about 5 mins of driving the noise goes away altogether. and also this noise has only been happening since i got the GMPP Preformance exhaust installed. The noise is kinda like a deep toned griding noise, just kinda like metal on metal. its not too loud or high pitched, it just sounds bad. and it mainly happens when im turning the steerin wheel, it always happens when im pullin away from my house. and toady it was happenin when i was driving straight, but very mildly, for example: in first gear i would go up to about 3500 then push the clutch, shift then as i was letting the clutch out and accelerating it would make the grinding noise until i let the clutch out fully and this is just driving normally ( note this was only until my engine heated up it seemed. so now you got basically all the symptoms can someone diagnose me? or has anyone got ideas.

 

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