If you don't have an oil cooler, this won't be nearly enough for some track abuse... Get an oil cooler first before doing this.
So far I have managed the avoid any limp mode but running the heater on max and cycle the water pump and radiator to max speed through JB4 max cool mode. Worked alright in cooler track temp, but when it is approaching 90f out there I still have to do a cool down lap every now and then.
My approach is upgrade the stock oil cooler to the Dinan one which I got it for a deep discount (good kit). Still deciding to whether just run aux radiator as it is, or use the supplied hose to route a bigger core. See this thread that I made
http://www.e90post.com/forums/showthread.php?t=1048496
Also ecs sells the full kit,
http://www.ecstuning.com/ES2770373/
You just need the air ducts and vents specific to which front bumper you have.