Rip-off is my bet. Mugen is to Honda as TRD is to Toyota. Mugen makes parts for Acura and Honduh only. It's their performance division. I wouldn't trust it. Someone's trying to scam it seems.
Also note that instructions are not provided, which tells me some scammer slapped a Mugen sticker on a generic intake. Maybe it does fit the Matrix/Vibe, but like Saved said, it sure as heck isn't true Mugen. They're 100% honda/acura anyway, like Tom's or Spoon