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Figured I'd test this myself since I am considering a Perrin inlet hose to delete the noise tube altogether. Stopped by Lowe's on the way home, picked up the 7/8" nylon plugs for $1.39 + tax, and plugged it in by feel alone in a pitch black parking lot - the hole is really easy to find based on the above pictures.
The difference in sound is pretty ridiculous for a 7/8" hole. My HKS exhaust and the motor are no longer overwhelmed by the high pitch of the intake and the car gives off a much deeper tone inside the cabin.
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