So im building this ek hatch from scratch and i have 2 motor options .
there both good deals, but i cant decide .

D16y7 - missing ecu, primary O2 and dizzy . $450 obo
D16y8 - missing nothing, complete w/ headers and intake too . $650

my question is, would the y8 pass smog in my ek hatch ?

 

Yes

 

would i need the y7 cat ? since the cat is on the header ?

 

Hey, I know this a late msg but did u ever swp that d16y8 In th ek hatch? If so, did you use the y7 cat or y8 cat to smog it? Or has anyone else done this swap legally? I live in Cali and cops strict about Lil hondas and go around popping all the hoods they can and I dontwant to fail state ref if they were tO pop my hood

 

Cali smog laws state that all emissions equipment must be intact, last I read. If you have a Y8 motor, use the Y8 exhaust. If you have a Y7, use the Y7 exhaust. At the end of it all, though, it should pass either way.

 

Well I have a d16a in my ek hatch right and I do not have a y7 cat/exhaust manifold. I looked around for a used one but they all have that Crack onto of the upstream 02 sensor. I looked up a new one and they are $600-$700. I rather just pick up a d16y8 for $450-$550 and get a $150 cat for it
Because that is how much the cats for ex model ek's go for. So that will work right? Or would I need the y7 cat even thought I will be using a y8 longblock?

 

I guess I'll say it again.

If you don't want to take my word for it, call your local ref station and ask them.