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Jason, my tests on rear 1/4 window ducts showed flow so poor, with my rads over the trans, they appeared to reverse flow at times, if your street legal you can run good 'tuft tests', also, if your feeding into the cabin, be carefull with high speed internal cabin pressure build up when they may stop flowing suddenly just as you need even more flow, not good, its easily possible to blow a plastic window out with internal pressure, as i had to run tests at night with a mate and a torch in the back as observer, they were a bit limited, but it was life or death for my motor as the ducts feed engine cooling, so i made up guide vanes to turn the air into the ducts, not pretty, but it works, so no worries now..
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