Well I just got done installing an AC Autotechnics SRI into my car. AC Autotechnics makes a short ram for 90-93 integras.
Price: $60 + Shipping
CARB Legal: Yes
The main reason I bought this intake was because it was cheap and CARB approved. However, once I received it I thought the filter was pretty fugly (looked nothing like the one pictured). So I bought I slightly used K&N for cheap (like $20 I believe).
The intake is pretty similiar to ebay ones (3" inlet to a 2.5" reducer). Also it only has 2 holes, so 90-91’s would have to use a “t” fitting or make another one. The intake came with all the hardware, except I bought some small pipe clamps from the Home Depot for the 2 tubes that run into the intake. The SRI comes with an ugly yellow tube to connect to the pipe coming from the valve cover. Personally, I find it ugly and Im going to replace the whole thing with a nice black tube.
Install took 25-30 minutes (Im not the most inclined person ever), pretty staight forward. The most trouble I had was trying to unpeel the damn stickers to put on it. I haven’t driven it yet, but Im sure it’s just louder. I can take pics if someone wants.
All in all seems like a good deal for people who want that oh so important carb sticker.