Now i'm planning on putting on an turbo soon and I got most of the parts but the intercooler. Now IDK what size to get I what to get something not so small but now crazy big... Does anyone know what size would be the best for me?

 

Are you going for visual impact? That's not really how you approach intercooler sizing. How you measure an intercooler's effectiveness is the design of the cooler itself - bar and plate vs tube and fin - and how you want that to complement your setup.

For example, if you're running a cheaper turbo setup with a smaller turbo and looking to run higher boost, stick with a tube and fin setup - they have a higher pressure drop but are more effective at cooling incoming air. If you are running a giant turbo and lower effective pressure or are more interested in overall performance, go with bar and plate. Most, if not all race intercoolers are bar and plate for the lower pressure drop across the core, but they are not quite as effective at cooling as the tube and fin, for this same reason - they're less restrictive, air can move across the core more quickly.

As for determining what's a good intercooler, better designs include making a larger surface area by increasing the HEIGHT of the intercooler, not the length. The worst possible design for a cooler is to have a short, long, thick intercooler. The best design is a very thin, tall, short intercooler. Think of how air cools and how the temperature of air changes across the core in both directions (through the core and across the core) and where pressure drop occurs, and you'll see why.

As for what size fits a Civic/CRX best, that's up to you...

 

me personally, whatever fits in there. lol. i'm using a 5.5 x 27.5 x 2.5 for my set up. its an ebay el'cheapo, but whatever.

 

all depends on how much cutting you wanna do