Hi, I purchased the black billet breather’s 12AN x 12ORB fittings also, because they have been tested by motion race works in there own drag and drive cars and passed their standards. I’m building a drag and drive car to participate in some of these events, 66 mustang with an Lsx 442 ci single 91mm turbo, Holley HP EFI, gear vendor’s overdrive, TH400 reverse manual valve body, strange 9” rearend with 3.23 gear for now, small tire car . Hyper fuel dual fuel pumps, Holley 120lb injectors, brodix ...