  Within QMD simulations we demonstrate the effect of virial corrections on
heavy ion reactions. Unlike in standard codes, the binary collisions are
treated as non-local so that the contribution of the collision flux to the
reaction dynamics is covered. A comparison with standard QMD simulations shows
that the virial corrections lead to a broader proton distribution bringing
theoretical spectra closer towards experimental values. Complementary BUU
simulations reveal that the non-locality enhances the collision rate in the
early stage of the reaction. It suggests that the broader distribution appears
due to an enhanced pre-equilibrium emission of particles.
