i am having similar sounds. does it sound like its coming from under the passenger floor board at times? i know where my sounds are coming from and if its from that area, raise the car up and tighten every bolt you see related to the suspension, (air tool required) mainly the spots where the 2 lower arms connect to the chassis and under your hood where the upper arm attaches. if you can, take out every bolt and dab some anti seize on it so water cannot penetrate and rust the bolts. my mechanic just tightened them for me last time and the noise went away until yesterday, after 3 days of rain. tomorrow he will redo them. MITSUBISHI mechanics are great friends to have, i fix his computer, he fixes my car, no labor charge!