Ok here is my question. I have a set of edelbrock ceramic coated shorty headers. They were on my O3 Sierra 5.3 and they made a nice difference. Nothing night and day but nice. How much of a difference do you guys think they will make on my 04 Denali. Just curious being that it is 325/375 vs. 285/325 hp/tg I am trying to decide whether to install them or sell them. Thanks