I have the UUC. I had a muffler shop put it on and they did have a little trouble. The tips angle out to the drivers side of the car slightly. Not too noticable unless you're looking for it. But for the money you would like it to fit perfect. I don't think it was as light as they claim it was, but still way lighter than stock. I love the sound, especially at like 2,000 rpms. Also UUC customer service is terrible. If you order one you might have to wait several weeks to get one. I really don't have any info on the AA. Just posts of people saying it sounds good. Hope this helps.