2002 Nissan Altima

Engine Mechanical problem
2002 Nissan Altima 4 cyl Front Wheel Drive Automatic 122000 miles

Are thee any common locations for exhaust leaks on this particular model? The car sounds horrible when accelerating. I would like to check the obvious before spending money on the wrong part. Also, what is the torque value for the exhaust manifold nuts? After replacing the manifold gasket, I torqued to what I was told, (24 ft/lb), and the noise is even worse. The lead gasket between the manifold and the front pipe has also been changed.
April 28, 2009.

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