Hello all, I have been scouring the forums for an idea of what might be causing this problem as I cannot locate what might be causing the sound. After the first 10 minutes of driving, while depressing the clutch pedal I hear a popping sound outside the car that I can feel in the clutch pedal. I think I have ruled out an issue with the clutch master cylinder and slave cylinder, as my engagement point does not change, clutch pedal returns fully, and I have no visible leaks from either mechanism. The sound seems to be coming from right behind the firewall and clutch pedal assembly. If anyone has any ideas on what might be causing this sound or any similar experiences I'd love to hear your thoughts. I have attached a video with the sound and some very, very dirty floor mats (Please excuse me for that ).