Do Adapter Plates Leak?

[HyperGSX]

My buddy is getting a Garrett T3/T4 hybrid and it requires an adapter plate to bolt up to the stock manifold. Should he buy a new manifold, or keep the current one with the adapter plate? And is it true that they are notorious for leaking?

 

[Omega]

They shouldn't assuming the manifold is straight. If they are both dead on he will not have any trouble.

 

[nine5raptor]

just use a quality gasket and check it with a straightedge

 

[GoFastTSI]

They leak. Get a tubular manifold as the adaptor plates are clownshoes and don't mate up well with the stock mani/garrett. Also a flow impedance issue. Don't be of the "Happy Hanukah" persuasion and spend the money on a Garrett manifold.