I lost that stupid cover and now that I've lowered the car it seems to increase the problem where the under pan vibrates making a noise at freeway speeds.
That panel covers a recess I see is built into the ZSpeed pan as well, only the ZS one doesn't have a cover like stock. How does this effect the aero? Is anyone with a Nismo ZS version getting vibrations? Is that fact that the ZS pan is stiff preventing vibration but not providing the same aero? Just questions.
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