I was underneath my car today, shaking, wiggling, tapping things around trying to figure out why my car is making this tapping/knocking sound. Upon acceleration, my car sounds like a helicopter! Ive tighten up the headers and the midpipe and even laid down next to it while ran, to try to find an exhaust leak but i found nothing......again. It feels like its coming from the drive shaft but the end links look fine and there isnt any play in the shaft itself, when i tried shaking it around a bit. The car has a 1.5 inch drop (i guess, i bought it this way) and its really starting to annoy me, especially since my idle is starting to hang again....... Thoughts? Suggestions? i recorded the sound but i dont know how to post an audio file.