Stock there isn't a gasket. As Will said if, both are flat there wouldn't be a need. The "gasket" I got from Rip is more of a stainless shim, that protects the plate from heat as much as seals. He also has the thick plates (which I also run). The plates are also slightly different from the 13ss and the 16ss.
It is the old style, which seems to work fine in a single turbo enviroment, but does have problems on high EGT/hp twins. Yours does look like it is still sealing, but the plate was leaking big time. When the plate leaks it wil only effect the boost/drive of the bottom turbo, not the top. When the wastegate pucks leak it effect the top turbo spool up, and a slight amount of total boost.
My recommendation... Get a thicker plate and stainless gasket/shim, seal it with K&W Copper coat spray (or copper high temp RTV if you must), and run your race next weekend. Look to getting the new style wastegate, in the future. If you are making enough heat to warp the plate, it's probably only time that you will bend the waste gate arm.
Paul