The exhaust pipe fits nicely into the manifold(I think). But when I idle, it is very loud and I can feel exhaust coming from that spot. There is a piece over that area that has two bolts. They are frozen and the piece is rusted. Last winter I got a new exhaust system installed, up to the manifold. I am a bit frustrated because it sounds like I have no muffler. I do not know the name of the piece with the two bolts. I need to replace that but is there anything else I should be looking for?