Jason V (Fort Wayne, IN US) | April 10th, 2008
I purchased the 9"x3" for a custom fender intake. What a sound difference. The supercharger is loving all the extra air. I had to shoehorn the 9" in and cut a lot of metal out but worth it. The 7" would be better if you didn't want to cut up your inner fender and tray. A must buy.