i'm not dissing the hdi cooler,
but
if your keeping air con, then you do have to cut a lot of the bumper out, virtually all the bumber needs to be cut, the reason is the thickness of the core, and with air con because of the fan that sits in between the bumper and radiator, you cant move the cooler back far enough.
without a/c you dont have to lose loads of the bumper, as you can push the cooler back further.
this is just from my experiance.
so imo
if you have
gt - autobahn or japspeed
glanza - hdi