Pay for the stage 8 locking hardware and be done with it so you can sleep well at night. I however did not go that route. I used the supplied bolts that came with my BBK longtubes and did not have a problem at all. I put nearly 1,000 miles on my car and when I took my headers off last fall to pull my motor everything was still tight. I also use copper gasket maker for my header gaskets. Works like a charm!