keep in mind, that the lower the car, the more negative camber you're going to have. Its ok to have a little bit of negative camber, because of extra handling capabilities, well in my opinion of course, but if you let your camber go, then chances are, you will do some damage to those tires and to your alignment. Anything lower than an inch a half, you should go ahead and get a camber kit and an alignment. Whenever you lower the car period, you should get an alignment, at least thats my precaution steps. People do it different ways, so youre going to have different answers. As for what this guy is installing for, im guessing you'll just have to do trial and error. I never take anyone's word for anything anymore, I just like to find out things for myself, so if you know and trust this guy, then go after the cheaper one, and see where it stands on your car.