Logan Paul, KSI Face Off At Superfight Weigh-Ins

Logan Paul and KSI just faced off one final time before they try to kill each other in the ring ... with the superfight weigh-ins going down Friday afternoon in Manchester ... and, of course, there were more insults.

KSI continued to go after L.P.'s girlfriend, Chloe Bennet ... walking onto the stage wearing a mask of the "Agents of S.H.I.E.L.D." star's face.

Logan hit back with a jab of his own by giving KSI some chewing gum ... to suggest his breath stinks?

It's no secret ... these 2 social media superstars have been training their asses off for this moment ... and tensions are high.

The undercard fighters -- little bros Jake Paul and Deji -- didn't meet face-to-face during Friday's event after the 2 got in an altercation at Jake's fan meet and greet earlier this week.

Legendary boxing announcer Michael Buffer asked Jake for a prediction ... he said he's gunning for a 1st-round KO.

Deji responded by calling Jake "delusional" ... and claiming it was Paul 's decision not to weigh in at the same time because he's scared.