Does a 2003 Impreza WRX have an intercooler

yup, located above in the engine bay. this is why WRX is have hood scoops.

Yes it is a top mount as opposed to a front mount that you see on most cars. It is located behind the big scoop on the bonnet.

Well technically its not an INTERcooler, its an AFTERcooler. but thats not important really lol

But yes, All WRXs(and infact most turbocharged Subarus) are aftercooled. The aftercooler sits between the turbo and intake manifold to make the air charge more dense, hence adding power and reducing the chances or PreDetonation.

dont need to say much on this question, the three guys above have said enough! just wana add this tho... get urself a wrx scooby and you wont stop smiling! awsome motors!