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Bends in piping can create pretty significant reductions in flow, especially when that flow is not pressurized (the air flowing through is not pressurized or barely pressurized). Air will take the path of least resistance and if there is less resistance sliding sideways over the front of the bumper versus going though a long tube with numerous bends, it will take that path. I have only enough knowledge in this area from years of playing with aquarium piping and studying aerodynamics to get myself in trouble, but someone with more knowledge in fluid dynamics should chime in.
You might do some string testing to see if you are getting adequate flow.
I hope you are successful as routing on this car sucks and I am interested in doing something similar, I just have a feeling it won't be sufficient for heavy tracking by an advanced driver.
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