I saw it. Looks like a normal Koyo racing rad, but the top was missing the cap. He has a K20A2 and he used a half sized one before, but started overheating at his last track event. So he opted for this one.
The only reason i knew that was cause a friend of mine had a Neon i think it was like a 95 and it over heated on us, cause it was hydro locked, and to release pressure my stepbrother opened the pressure valve, it's basically the same as a rad cap, just on a coolant hose and not the rad.