It also depends on when the hissing or leaking noise happens...
If you hear a noise while accelerating it's more than likely a leak...
If you hear a noise after a rev then it's more than likely the hissing noise mention aboved...which is somewhat normal...
coutesy nissan sell oem gaskets cheap...or at least that's where I order mines. You can also put the quick gasket ontop of the metal gasket to ensure a uber tight seal...
also thread locker helps preventing the exhaust nuts coming lose...
trust me someone can torque down and exhaust nut and under WOT...you'd probably be able to unloosen with your hand...
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