  There exists a $C^2$-open and $C^1$-dense subset of vector fields exhibiting
singular-hyperbolic attracting sets (with codimension-two stable bundle), in
any $d$-dimensional compact manifold ($d\ge3$), which mix exponentiallu with
respect to any physical/SRB invariant probability measure.
  More precisely, we show that given any connected singular-hyperbolic
attracting set for a $C^2$-vector field $X$, there exists a $C^1$-close
multiple of $X$ of class $C^2$, generating a topologically equivalent flow,
which is robustly exponentially mixing with respect to any physical measure for
all vector fields in a $C^2$ neighborhood. That is, every singular-hyperbolic
attracting set mixes exponentially with respect to its physical measures modulo
an arbitrarily small change in the speed of the flow.
