well in all honesty,,,,all intercoolers are not the same........some are more efficient and effective at what they do...........having said that, a number of OEM intercooler have been used by ep82/91.....VR4, BMW, EVO, GTIR, Starion (very good size for the starlet/glanza), etc i would say the ideal size should be around 24"*8"*2.5" and these are overall dimensions...anything bigger and some cutting may have to be done........the starion has an intercooler with approximately these measurements and flows well....from what i've heard