Hey guys, my e46 makes kind of a grinding/humming noise while driving at around 1-3k rpm's in first and second gear. it doesn't do it if the clutch is in, it's almost like the noise our cars make in reverse, but not as loud. Is this a problem? Any way to fix it? I've tried searching, but everyone else who is experiencing a grinding seems to have the noise while shifting. I drove a g35 today, and it seemed very smooth, no humming whatsoever. I notice it most when driving in a parking lot in 1st gear at around 2k rpm's. What could this be?