I think there was a subtle difference in sound, slightly more aggressive, but very slight.
If you are interested, I have K&N filters I need to sell. They had a little over 5k miles on them. I've just been slacking to take pictures and make a thread.
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Current Ride: 2012 Chevrolet Corvette Grand Sport Centennial Edition Carbon Flash 6M
Previous Ride: 2009 Nissan 370Z Sport Platinum Graphite 7AT
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