Ever considered building your own headers? If you can weld (gas, MIG, or TIG) you can do it yourself. Buy the collectors and the mandrel bent tubing, then cut and fit the tubing with a bandsaw or hacksaw to make the header tubes. Weld them all up, and get them ceramic coated. It's actually kind of fun to do, and you'll have a great sense of accomplishment when finished. Lots of people are scared to try this, but its not that hard...