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You should be happy with the twin oil coolers. I run a 2008 135i manual in Australia in races of up to 12 laps in temperatures around 104F and the limp mode problem is totally gone. I did later fit the larger CFS radiator but only to give added protection on really hot days when the car may be gridded up for long periods while waiting for track clearance activities to be completed. The ER comp oil coolers are expensive but they have been one of those set and forget mods.
My car runs a square setup using a second pair of 18x8.5" factory rims on the front. It is a good interim solution for me as imported wheels are very expensive in Australia.
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