Hi Meinmd,

My Accord has a windows sticker on the left rear window that says SULEV (Super Ultra Low Emissions Vehicle). I"m not sure if the ULEV CRXs also have that or not. Also, and more obviously, it should say it right on the engine. Mine is stamped with "SULEV-VTEC" in big letters right on top of the fuel injection unit.
If your's is from the East Coast there's a good chance you don't have it, but in any case, stick with the OEM parts, or Denso brand.