  The existence and uniqueness of stationary distributions and the exponential
convergence in $L^p$-Wasserstein distance are derived for distribution
dependent SDEs from associated decoupled equations. To establish the
exponential convergence, we introduce a twinned Talagrand inequality of the
original SDE and the associated decoupled equation, and explicit convergence
rate is obtained. Our results can be applied to SDEs without uniformly
dissipative drift and distribution dependent diffusion term, which cover the
Curie-Weiss model and the granular media model in double-well landscape with
quadratic interaction as examples.
