good price! how many miles on these?

Are these DIY? Is there any other parts needed to install these?

These came as part of a deal when I purchased my exhaust. The guy could only tell me he had these on for less than a year.

It's a straight install which I've heard it's a pain in the **** to do. If you have the time, patience and tools give it a shot. If you're short tempered and mechanically challenged, better let a mechanic or an experienced wrench monkey handle it. I think all you'll need are new gaskets.