It's strange... i'm interested myself in finding out what it winds up being. OP, have you attempted to snug any of the exhaust bolts down yourself or clamped down the intake pipes a little more? Is there any sort of rough idle that might give the indication of a vaccum leak? If you have a friend that can get in the car and rev it a little bit, you can mix some water and a little dawn in a spray bottle and spray all around all the areas where things are clamped and see if there are any bubbles that come from any of those areas... you can also do the same with your vac lines, it could be maybe something small like maybe even a cut in the vac line or silicone tube for that matter.
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