In my 97 a few years ago I bought some brass on bronze donuts for the uppipes. Well I'm about to sell the 97 and the up pipes move in the collectors and I see soot out of them. So I'd fix it before I sell it if I find a reasonable fix

 

Years ago I bought those kind of donuts and had zero luck with them.

 

So what's a easy cheap fix so I don't feel bad selling a truck with leaky uppipes

 

Try tighting them if it doesnt work just tell the individual that it has leaky up pipes