I wouldn't be worried whether it's legit or not, now if your ordering them on amazon maybe different story. But as someone has already said Denso is an OEM manufacture for Toyota. Meaning toyota doesn't make the part, denso does... and by buying it on rockauto you save a ton of money for the exact same product. I wanted to replace all three of my coil packs a while back now and ordered a set of 3 and the denso coil packs, and wires / boot set off rock auto and put them in my 4runner and so far they've been great. They look the exact same as my original OEM ones I took out, besides the Toyota sticker. Most of the stuff I try to avoid on rock auto since it is usually crap. But sometimes you get lucky and find a OEM manufacture part made by either Aisin or Denso. Saves you lots of money for the same exact parts!