I wouldn't have thought there would be enough room to fit a duct inside the caliper at the front end of the rotor. That's pretty awesome.
Did you previously having cooling ducts set up (like stillen's kit) and found the 2" diameter tubing not being enough?
I've only tracked with upgrade pads and fluid and only my fronts have been stressed, heat-wise. Rears have been fine. But I also don't expect to need more than 2" diameter ducting for a long time.
Removing the dust shields should help a bit, too.
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