we are getting a large number of turbo MR's2 and GT4's in with blown exhaust manifold & turbo gaskets. these are almost all cheap gaskets sourced from on-line vendors. they simply don't last.
The aftermarket turbo manifolds dont help, as these commonly buckle shortly after fitment
 
here is a picture
https://www.facebook.com/media/set/?set=a.388405451274809.1073741827.303149363133752&type=3
 
we stock the correct 7 and 9 bolt multi-layer steel gaskets 

Agreed. I only buy genuine Toyota after a couple of failures of cheapie gaskets