So after looking closely, the ship details state the 315 has TWO Addition Equipment Slots which are filled with a Jump Engine, and Long Range Scanner. Where as the 325 only has ONE and is filled with a Custom Targeting System. Does this mean I HAVE to remove my Custom Targeting System in order to have a jump engine or what? Everywhere I look, everyone is contradicting one another and some saying all 300 series come with a jump engine.

Can someone from CIG PLEASE clarify?

Also, shouldn't all of the 300 series have the same amount of slots? I see no reason why the 315 has two and the others have one.