Have you ever held a set of TTIs in your hands ? Trust me theres a reason they are more then others. They are built much better. Thicker flanges, better welds, better fit and coated inside.
YUP AND UNLESS THEY ARE MADE OF SOLID GOLD THERE IS no HEADER THATS WORTH $600+ I dont care how "nice" they are made oe how great the coating shines..there is NOT $600+ worth of materials in them AND their initial investment has been WELL recovered at those prices(ive heard the EXCUSE they are so expensive becuase of the initial R&D cost)so yes they ARE exellent headers(they are on the father in laws Coronet R/T the whole TTI system headers to tips came on the car when bought so YES I have seen these headers)