Should I just sell off all my mods below MkV? Since unlocking Tier3 mod challenges I have begun to amass a good number of MkV mods and I'm wondering if I should just sell off everything else. They can't be sliced or upgraded if they're below MkV, right? Is there any point in keeping them? I'm at the stage of the game where there's a Serious Credit Crunch and I wasted credits upgrading the first few mods I got, because newbie, but now I'm ONLY upgrading MkV mods.