I'm running basically the same FBO setup on a 335i x drive with the 6.5" stepped VRSF intercooler and yes it's winter right now but when I beat on her IAT's stay around 7-10 over ambient, which is pretty good. Haven't been able to test it when it's really hot since I got the car in November but it stays nice and cool so far.
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2013 335xi F30 - Mineral White Metallic
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