I put a stock cat on my rx8 about 4 months ago and i got the gasket for it from mazda and i was just wondering, because im now putting on an agency power DR midpipe, if i can reuse or buy the same gasket that i bought for the regular cat.... also i am hooking this up to the stock exhaust, for now, if that makes a difference for hardware i might need... thanks!

 

You can reuse the gaskets and hardware.
I did this a few times when I had the AP midpipe.
I ended up buying bolts, washers, and nuts from the local hardware store for the rear section of the midpipe because I hated that studded-bolt on the cat (the one with the springs).
So now I just keep that on my cat and my current midpipe has its own hardware.

 

thanks jon! you've come in handy twice now with good information