Got a few question's about Kooks headers. How long does it take to install them and how hard is it. And also I see on JDM's site they have them for 1,895 but I don't won't converters I guess they will knock off some of the price. And also I was wondering about what size mufflers to get the 4x4 or the 4x9 I know the 4x4's are louder but just how loud.