  Historically studied in the context of heavy-ion collisions, the extent to
which free nucleon-nucleon cross sections are modified in-medium remains
undetermined by these data sets. Therefore, we investigate the impact of NN
in-medium modifications on neutrino-nucleus cross section predictions using the
GiBUU transport model. We find that including an in-medium lowering of the NN
cross section and density dependence on $\Delta$ excitation improves agreement
with MicroBooNE neutrino-argon scattering data. This is observed for both
proton and neutral pion spectra in charged-current muon neutrino and
neutral-current single pion production datasets. The impact of collision
broadening of the $\Delta$ resonance is also investigated. The absence of
$\Delta$ broadening is slightly favored, but the larger uncertainties on the
pion production data prevent definitive conclusions.
