I'm expecting my Flowmaster American Thunder Cat-backs in the next day or two... That said are the stock exhausts worth anything for resale?

 

Considering what you could actually get for them, I would just hang on to them in case you ever wanna convert back to stock when you go to sell the car. I've always kept my stock stuff for any vehicle I've modded and it's come in handy multiple times.

You might get 70 bucks for the stock mufflers?

 

keep them somewhere, if you ever need them it'll cost you a lot more than what you'll get for them now.