yeah, i didn't know how that worked either. that's a pretty good incentive to keep plowing my way through PT.2......i want to get to 2.5 and host an online game so i can get some good loot instead of the "meh" garbage i've been getting lately. is 2.5 where you find more orange weapons? i'm looking for some good shotguns... --- PSN--nogimmick420 (mic'd, borderlands, GTA4, LBP, resistance2, saints row 2)
Sorry if the answers above were explanation enough, but...
after you beat the game in playthrough 2, all the enemy names change again, they have a minimum level of 48 (that I've seen) and a maximum level of 51. All drops (including chests and vendors) are at least level 48. In fact, every "drop" and item I've gotten in 2.5 has been level 48 EXCEPT for one Eridian Thunderstorm which was "green" rarity, but had an unmodded, game-spawned level of 49.
There's no actual choosing to play on "Playthrough 2.5", though. You choose "Playthrough 2" after having beaten it and the unofficial 2.5 is in effect.