months ago. It was very easy to download, took about 5 minutes. The gains aren't significant, but they are there. Also, throttle response is quicker. I also installed a CAI as I think the 2 work together well. Gas mileage stayed the same. It raised rev limiter, and driveability is better than stock. Cost for Shark Injector around $400 smackers. Next upgrade for me will probably be a cam.