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the design of the TT oil cooler is such that the cooler is only used when oil pressure exceeds 45-50PSI. The cooled oil goes back to the oil pan instead of directly to the engine, so it is not effective for short spikes in oil pressure (eg. under hard accel during drag racing). If you stay below that most of the time, then a larger oil cooler is useless. The NISMO cooler makes sense for Europe when they are running 100+mph for long periods of time on the autobahn. If you are set on a larger oil cooler, fluidyne makes one for the new corvette that is designed to be mounted in front of the radiator, and maximizes air flow through the cooler. They are a little more expensive than the Stillen or Nismo units though.
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