To make these headders they used one of my friends car form NECO.
He said it looked like to test fit, they lined it up by eye sight and said "yea that will fit." they were not even test fitted to the car.....i guess they have fixed a lot of the stuff with the headders since then, but i would not trust the quality.....i saw the set Weapon Rice gave him and they were very porly made.Also there knock offs of the MSDS...made with very thin stainless steel.a lot of design flaws.
I would stick to the MSDS headders and go with that...anything else hasn;t been proven IMO.
Lupe