I can't decide if there are more active header threads or timing adjuster threads.
Hooker, SHM, Kooks, and BBK are all respected headers. MAC is a cheaper and less respected option. Your exhaust doesn't care one way or another which one you use, although you will need to chop up that X-pipe to make it work. BBK and Hooker seem to be good compromises in the price dept.
Right now I have packs with a prochamber. My new exhaust set up just arrived though, Mac LT's with a Mac o/r h pipe. Man I cant wait to get it all installed.