Just installed my new ARK exhaust....went out for a drive tonight to play with it and every time i make a right or left turns....i could hear something behind is rattling like its hitting on metal. Went straight home to jack up my car and checked to see if all the piping is tightened and I couldn't figure out whats the problem. Just 2 weeks ago, my brother installed the same exhaust for his g37 and he finds no problem...no rattling or whatsoever. Any suggestions?

 

check to see if its hitting your heat shield, frame brace or sway bar

 

check the m or w support under the car towards the end of the drive-shaft before it connects to the rear end.
the thing under you car that looks like a w or m, depends on what angle your looking at it lol
its just a body roll support and some cars it will hit the exhaust.