I've got an exhaust leak where the exhaust manifold meets the exhaust pipe on the right side of my truck. Can't get it to seat and stop leaking. Do they make any kind of gasket or sealer that I could put in there to help this thing seal? Thanks in advance.

 

OLD-old car I had the Y-pipe wasn't bent properly and the doughnut gasket never sealed.
Looking at the wedge shape opening, I bought 2 doughnuts and belt sanded both 1/2 way down on one side. making sure to put an off angle on both.
No more leak.

JUST IN CASE you were thinking... Some dude back then tried fireplace sealer in a caulk tube. Didn't work, exhaust pressure spit it out.