the purple one I'm guessing is hpi. but really no idea. anyone know brand and model of either of these

Hard to say, the purple chassis looks aftermarket. Overall the car looks like HPI or Hot Bodies. The other one might be Associated or Tamiya maybe?

figured out black one is a duratrax evader. still in the dark on the purple one

Purple chassis one is some kind of nitro touring car. My guess would be one of the China clone companies, Himoto, Redcat, iron track etc. I doubt it's a Hot Bodies or Mugen, both used purple anodizing at one time, because they wouldn't have made the knuckles with large round discs on the end to simulate brake discs.

HPI also used purple almost thought it was a RS4 chassis at a glance due to the color.

But agree it probably isn't one of the bigger companies that sell under their own brand

Quick look at engine position eliminate RS4 type 3 that's why I didn't include HPI in my post at all. I'm not familiar with Hot Bodies or Mugen nitro touring cars (not gonna look them up either) but I doubt it's one of those due to the knuckles. They and other major Mfg's wouldn't have made the knuckles heavier with those discs on the end like that. Gotta be a clone.

Although now that I look at it again I'd like to revise my previous statement about it being a touring car. Those shock towers are too tall to be a touring car. I initially thought touring car due to the arms being shorter than the truck next to it. Lots of those clones use shorter arms (than a typical stadium truck anyway) on their 1/10 4wd buggy and monster trucks that share the same chassis. Still some sort of clone as far as I can tell though.