Can you get an exhaust gasket in backward and still bolt the intake manifold on? I think that's what their asymmetrical profile is all about. I have never tried it but IIRC if you get one in the wrong way it wants to overlap with the intake manifold gasket.
Typically you will hear some extra exhaust noise if it's an exhaust leak upstream of the turbo -- a shrill whistle or chuffing sound if it's one of the header gaskets. Notice any changes in sound?
If you're able to take a picture and post it here, will probably make it easier to get ideas for what and where the problem is.
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