Need Better Turbo to Manifold gasket.

[FORMONTOYA]

The 2G gasket has a 7cm ID. What you're forgetting is the blow-out ring between the T25 and the exhaust manifold. You can also order it from JNZ here:
http://www.jnztuning.com/catalog/product_info.php?products_id=110
If you enlarge the photo you will see it's a 3 layer gasket, or if you feel so inclined, buy one and take it apart.

 

[Calan]

A little late , but for future reference Forced Performance sells the 7cm multi-layer OEM gasket as well.