i always thought that the biggest rivals were bloods and crips. am i still livin' in the past? i've never heard of ms13. if i was to take a guess, i'd say that you and your boys started a click from it, and needed a rival so you picked the 18th st. gang, without their knowing it. so now you're running an unknown rivalry with them. just a thought. if you don't like it, shoot me.