I have a 2003.0 G35 sedan and whenever I take corners hard or regularly over inclined corners I hear and definitely feel a loud THUD coming from what feels like the rear area of my car. To give an idea of how obvious it is, passengers are always asking me if I hit something when it occurs. You can hear it loudly and you can feel it in the car. It kinda sounds like something falling into place. Anyway, I'm not sure what it is but if anyone can clue me in.... please do. Thanks.