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Excellent point Bill! I know of two race cars with coolers that are smaller than what some of us run on our street cars. One is a front mounted cooler, but it is mounted in a RSR bumper, but with adequate spacing between the cooler and the car so that air can flow "through" the cooler. Driver reports oils temps never get over 180F. The other is a fender mount, but the ducting is so good it must have been more than adequate (car has been disabled for some time, but the owner was a a shop owner and the car was built be a very reputable shop....no reason to think it had heat issues..otherwise it might have been replaced!). AIR FLOW!
Two parrallel cooler is very doable, but why? More fittings, and parrallel coolers would have a slight problem with differing flow. Flow follows the path of least resistance. So unless you can make the differential across both coolers identical (identical coolers too!) at all flowrates, one will always flow more than the other.
Two in series guarantees that both coolers will see the same flowrate. Yes one would be less efficient than the other do to a lower delta T, but you'll always know there is flow through both.
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