SWAG: $400 parts, one six pack of beer for installation ... plus a promise of a ride in the car afterwards.
Don't forget, you'll need an
oil thermostat if you put a cooler in (so that the
oil comes up to proper operating temperature).
Of course you could just mount the
oil cooler and not connect it to anything.
FinishLine has coolers and aluminum shrouds for the cooler.