I think that all this is for nothing. I know that headers work and the MSDS headers are reasonably cheap HP that comes ceramic-coated, has a provision for the vortec supercharger as an add-on later, and works on the 3L as well. Why would I want to bolt on a set of factory mild-steel or cast iron manifolds when these great tubular ones are available? Jeez, people paid the full $1200 for SHM headers just 5 months ago.......