I haven't experienced overheating either, as I don't track the car, but it's been pretty well documented that the 370 needs an oil cooler for serious track. That does not include short 1/4 mile runs that really won't do much since there is so much cool down time between runs.
I doubt that the overheating issues of the 335i are much different than the 370z.
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2012 Mercedes C63 AMG P31 Sedan, ROW, aFe, Eurocharged Dyno Tune. 438WHP/415WTQ
2010 SOLD: 40th Anniversary 370z
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