I was driving with a passenger today, and didn't play my stereo full blast, and heard a sound as i was driving from the engine. To provoke it i have to gain some speed and then pull the foot off the accelerator. It sounds like something is grinding/rattling. If i push the clutch all the way i can also hear it. The sound isn't very noticable, but you can certainly hear something wrong I removed the bluefin map but the same sound came... Any ideas?