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It does drone but only at lower speeds and during street driving in 2, 3 and 4th gear. Freeway driving at cruising speed is not a problem in regards to drone.
This is different than just being in sport +, because while in sport +, the flap is constantly opening and closing part way to eliminate drone, this mod keeps the flap fully open which makes the car louder in the lower RPM range.
After a month of driving around with this mod, I just plugged it back in to stock form, mainly due to the cold starts creating earthquake like rumble and I was living in fear of being marked for death by my neighbors.
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