The factory cooler/stabilizer is a good feature, you dont really need to remove it unless you are seeking the lowest temp possible in any condition with very large external oil cooler.
It's purpose is bringing the oil and water temp close to each other. It can be called as cooler or heater depending on which side is hotter.
During cold start, oil takes so much longer than water to reach its optimum temperature. Having this stock cooler/stabilizer helps oil heat up quicker for cold start by bringing oil and water temp close to each other..
During normal driving conditions, oil temp goes slightly higher than water temp. Having this stock cooler/stabilizer helps oil cool down by bringing oil and water temp close to each other.
During hard driving conditions, oil temp shoots up so much higher than water in stock setup without external oil cooler. Again, stock cooler/stabilizer helps oil cool down by bringing oil and water temp close to each other.
During normal driving conditions WITH large external oil cooler, it takes so much longer to heat up the oil to normal operating temperature due to rapid cooling. Again, stock cooler/stabilizer helps oil heat up quicker by bringing oil and water temp close to each other.
The only time you are better off without the stock cooler/stabilizer is when you have a very large external oil cooler that can bring your oil temp lower than the water and you want to keep it that way for as long as possible - ie, full on race build where you dont care about warming up. its just like using low temp thermostat for water to keep the car cool as much as it can.
Remember, low temp is not always the best. Keep the stock cooler/stabilizer, unless what you are looking for is small bit of weight reduction or have a very specific goal to achieve.
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