provided the upcoming headers show nice gains, i will probably be purchasing some. However, i doubt i could install them myself, so i'm hoping someone here might be able to estimate the costs of having them installed. Also, future mods include UDP, y-pipe (if not included in headers package) and a cat-back system. For the headers and UDP, should i wait and have them installed at once? would this be cheaper/easier for the mechanics? and is the y-pipe/cat-back do-able for semi-knowledgable person like myself? gotta know how many hours i'm going to have to work this summer