I bought my headers a long time ago, when i was wondering if i would do them myself of have a shop do it, revextreme was the least expensive i found in the area.
you could probably save some coin buying them online somewhere and just having a shop install them.Its a double edge sword with these things, its great to work on the car yourself, gain experience and all that crap but knowing what i know now....no more LT installs in my future!!