I have an 85 crx si and it still have the stock d15 but soon im going to swap in a zc, and im looking for an intake that will work for both or just the zc. ive heard that since it is an si i can use one off of a gen 1 teg, also ive heard of people using a gen 2 rex intake. what will work the best?

The bolt patterns on the intakes for an '85 SI EW/D15 and a ZC are nowhere near the same (assuming that your talking about a D16A1-ZC). All D16A1 intake manifolds from 1g Integras use the same bolt pattern regardless of wether it's a ZC or not, so these won't work on your EW/D15. A 2g D15 intake will bolt onto your EW/D15 but there will need to be some modification done to the ports in order to get it to flow properly since the '88-'91 D15 uses oval ports where your '85 EW/D15 uses round ports. I have not yet found a manifold that just bolts on to the D16A1, I have a few ideas in mind, I just haven't verified that they will work. I can however tell you that if you get an '86-'87 D16A1-ZC, you can swap your intake for the slightly larger intake from any '88-'89 D16A1.

In short, you're stuck with what you've got.