ebay headers and turbo kits

hello everyone, ive had a qurious question. does any one have any knowledge on the turbo kits on ebay are they reliable or junk. how about the headers that they list on ebay ive been looking and some actually match the hooker headers i actually have now. Im starting to have some problems with the ones i currently have no thanx to the muffler shop when intsalled two years ago. i was looking at one of these for the meanwhile till the stainless works or kooks headers nextyear or the year after any advice would be greatly appreciated.