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OP, I am good track buddies with the guy that installed the Do88 coolers. That car and driver is VERY fast! I mean the fastest car that shows up to the track. With the diffs on line lower gears it (plus every go fast mod you can think of) it is putting a lot of stress on the DCT. Given that he has demonstrated/documented temp reductions I would personally go with the Do88 without question. When considering other options running a 25 hour sounds impressive.....right? Well consider that it is so cold during that race that teams sometimes have to place cardboard in front of the coolers just to get the engine up to operating temperature (2014). In 2015 i think the high temp was in the 40 degrees F so the cardboard was not needed.
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