JP...perfect reply. Serge...trust me.. JP is right on the money. You can also go with a Hayden 28k cooler, or if serious mods/gears are in your future, step up, and get a tru-cool 40k cooler, and by-pass the heat exchanger completely. They even offer a small aux fan to go with it for extreme cooling capabilites.
But knowing you, and what you do with the car, 26k minimum, get the correct fittings, and be done. Simple, effective, and a tranny-saver. I use a hayden, and it has made a killer difference. I dont have a guage, but there is a 50 degree difference between in-flow, and out-flow when measured using an infra-red laser-tech heat sensor.