Hey all, I know I cannot be the only one on here with an iphone, but I also have a g-tech meter. I downloaded the FREE app and gave it a whirl next to the g-tech meter to check its accuracy in comparison. Needless to say, they are about dead-on with one another (+-.05 secs), including rwbhp figures (rwbhp was +2 bhp of what dyno yielded). So for those of you who do not have this app, get it, set it up according to the weight of your car, and get a proper mount for your iphone in the car so you can get an accurate reading. Just don't beat on your car! -j