Not sure of the model number, but you can find a set of pump flows versus model number for the mags at
http://www.marinedepot.com/ps_AquariumPage.aspx?PageAlias=powerheads_pumps_danner_mag_drive_supreme">http://www.marinedepot.com/ps_AquariumPage.aspx?PageAlias=powerheads_pumps_danner_mag_drive_supreme</a>
Just scroll down. The Mag5 is at 500 gph.