The radiator is shorter from the cav or cally turbo than the standard astra one. The intercooler is mounted on to the radiator and fits in. The only problem i had was getting the radiator fan to fit as the turbo elbow limits access. I used a ford rs turbo fan but it has since melted. FORD CRAP!!! as for uprated intercoolers i have fitted the frontera 2.8 intercooler. Had to modify front bumper and move oil cooler so it would fit.
Hope this is some help