I have 18" CF and FI HFC's and I don't have any rasp. There is a bit of drone like was mentioned above... but hell, I could even get the stock exhaust to drone at a certain RPM, the range is just a bit greater now.
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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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