Got this shipped to Australia with the sound tube. I swapped out earlier the paper filter for a high performance filter and it improved the car however was a little breathless climbing to 5,000rpm and slower beyond. I was toying with the ideas of CAI. I had a look at photo of the air volume photo showing improved volume, less turbulence and higher intake velocity, a mild ram air design. Swapped out the stock and as the air flow sensor was recalibrating from the drive, I opened her up on the motorway. I noticed that the engine was eager and spun at the way to the redline from 2nd, 3rd and 4th. I was really impressed. I also noticed better torque at 3,000rpm making shifts smooth or less needed. It has made the fun factor even better.