I know it’s a long shot but does anybody have comparisons to the different shorty headers as far as performance? If I’m not mistaken, z1 headers can only fit with a certain setup. My current setup is Stock Headers, Motordyne ART and catback.

 

Z1 shorties can only mate to DE flanged HFC/Test Pipes so your ART pipes won't work. I have Motordyne CBE/ART and DC shorties but I am not tuned yet to notice a difference.

 

Stillen headers and Z1 make almost the same amount of power