Does anyone have the problem of an exhaust smell when you have the soft top off or you have the soft top on and the back window open? I checked my exhaust system and it seems to be okay. I tightened up the manifold bolts and looks for leaks and found nothing. I did notice that the only time I do smell it is when I let off the gas or downshift. I extended the tail pipe with a crome extension and it did not seem to help. This is driving me nuts. Is this a Jeep thing?