Stock intake size

Hey guys, i have a 94 accord EX 4dr and want to install an intake, but i'm not gonna spend the frickin 200 or so bucks for a nice intake. So, i'm gonna build one, got a website that describes the installation, but it's for a del sol, i know i need to make some modifications. Anyone know what the size of the stock intake pipe is on the Accord, 2.5 or 3?? Or does it really matter...