dude,
mocal intercoolers usually have 1/2" bsp fittings and the supplied hoses are 1/2" bsp size too.. at least, its difficult to determine what the hose size is
they all talk in fitting size and each manufacturer of fittings have their own hoses.. i went fir 1/2" bsp fittings and hose, but as i recall from the old forum, someone had some issues with dropped oil pressure with too large a hose size.. if you check the internal diameter (i will measure mine... oil cooler hose size i mean by that of course
) and let you know.. as long as you stick with 1/2" bsp or an 'an' size that is close too or one notch less, you should be fine.. wendyson used a 'an' size hose one notch less than 1/2" bsp on his 5e-fte and that works fine..