Hi,
Its best to modify the bumpers slightly in order to give maximum surface area of air hitting the 'cooler face. This might mean a bit of trimming of the bumper.
The core itself comes with a fitting kit (brackets etc) so fitting should be fine. Although the amount of room available to fit the 'cooler core varies with each car and wether they have an aftermarket bumper on or not.
It depends on what mods you are running. An intercooler kit will benefit most of the time unless you fit one that is too large which will cause too much turbo lag.
What mods are you currently running?
Thanks,
Dan