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Cooling is not a big issue on these cars. BMW M over engineered it from the cooling aspect. The air to water intercoolers are much larger than that of the 550i. There are plenty of radiators and even under track conditions, no issues with overheating with the exception of the brakes at the end of an extended 20 minute session at the end of the day.
tune is great, hi-flow cats/downpipes would be good mods but you need the dp fix which I don't believe anybody has yet. Meth would be interesting from a plumbing perspective and nobody has a meth tune yet.
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