  For a non-compact hyperbolic 3-manifold with cusps we prove an explicit
formula that relates the regularized analytic torsion associated to the even
symmetric powers of the standard representation of SL_2(C) to the corresponding
Reidemeister torsion. Our proof rests on an expression of the analytic torsion
in terms of special values of Ruelle zeta functions as well as on recent work
of Pere Menal-Ferrer and Joan Porti.
