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I have spent a lot of timing studying brake cooling because the issues M3/M4 platform has when driven hard at the track. One of very important information I found by talking with BBK manufactures and measurement data is that cooling efficiency is extremely important.
Unless the air intake is located on high pressure area on bumper and ducting has small bents w/o 90 degree curves there is a chance its efficiency will be compromised.
I made a measurement on air flow at the rotor side on a design similar to this and found out the air flow dropped by ~ 65%. It was enough for me to abandon the idea and move to BBK.
You can measure air flow (Amazon) has a lot of cheap air flow meters.
Good luck!
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