You can't run w/o a gasket because you WILL have an exhaust leak which reduces back pressure and loss of power, it can also cause engine damage along with a horrible gaseous smell (from the leak) and horrible gas mileage. I purchased BBK headers for my old car (02' Mustang GT) and installed the gaskets that came w/ the kit....they were s**t... pretty much like tin foil, so after a week they leaked so it's no surprise you had crappy gaskets come w/ ur header. I'd recommend what I had to do, buy high quality gaskets (I bought copper one's from Summit) and red RTV the bad boys on!
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