Tom pretty much explains the whole process to you once you place your order. If you're having trouble, there's also an option to remote in to your computer to get everything set up, but it is pretty simple to do on your own. But I agree, the custom tunes Tom put out has turned my transmission that was somewhat good (like a B grade) to one that's nearly perfect (A-). These cars don't have perfect transmissions by any definition, but having them dialed in to your driving style/optimized to their abilities is a huge plus.