A freakin muffler. Great jebus I can hear those things a mile away and it makes sneaking into a lightly defended area a pain in the **** if even only one defender has use of one ear and his hearing aid battery is failing fast. /discuss
If the stealth upgrade line included a muffler, even if it was at the final upgrade, I would cert ALL OF IT. No second thoughts.
Indeed. Adding a progressively better muffler per stealth level to the point its pretty much silent except under 10m would be a no brainer for me.