I purchased a used 2003 Evo that supposedly had a non-factory clutch replacement. When I slowly release the clutch at 1st and 2nd gears, there's a loud groaning noise that's emitted. I'm not sure where the sound comes from, but it seems to come from the engine bay. If I quickly release the clutch at 1st and 2nd gears, I don't get the groaning sound. Also, any other gear (including reverse) will not result in the sound.

Does anyone have an idea what could be the cause of this and whether it should be of concern to me?

Thanks.

Sam