All I can say for now is, stay tuned to this frequency - there may be some significant developments I can report on soon. Testing is going on as I speak. An earlier prototype version of this header was tested on an '02 Z06 and registered a dyno change of 17 rear wheel h/p over stock. However, certain highly customized portions of this unit were VERY expensive and not deemed practical for sales volume needed to amortize costs. At this point, testing of alternative less expensive designs is ongoing.
This is all I can say for now - so please don't ask me to provide any more info. Also, there is no ironclad guarantee that the less expensive variants will be successful. If and when they are, full before/after dynojet testing results will be provided to the forum..
Also, if there is success, I have made some progress in convincing the developer to consider a group purchase. I know I'm keepin' my fingers crossed.
As an extra tidbit, think I found a premo place to do header coatings...