Here is an older video of the grand prix when it was nearly stock. The only thing done to it was the stock air box was removed and a small 6" Spectre air filter was put in it's place.
The video and sound are WAY off as I was just learning how to take a video with the new phone at that time and I messed something up while trying to do it. You can hear the audio at the beginning. The supercharger is noticeably louder in the newer video with the larger air filter and full intake on it.
Fast forward to 1:10 to see the take off. I spun some in first as I was launching hard, so that's why it jumps from 0-30 MPH so fast. The main thing you need to compare it to on the older video is the acceleration in second gear (45MPH and up). The newer video shows that it is noticeably faster in accelerating.
YouTube - '05 Grand Prix GTP Acceleration (near stock)
