Exhaust Bolts

Pypes sent me nylon lock nuts with the x-pipe I had, but thats not saying much in my opinion. However, they were fine when I pulled the pipe off over the weekend. The Mac h-pipe I just installed came with all the neccesary hardware, and locknuts weren't included. The flanges came with double threaded studs (threaded on both ends) and regular nuts that seem to be holding just fine.