I have a 41 also and if it's a round spring about 1 inch diameter it goes on the manifold. On the underside of the manifold there two little rods that stick out the side of the square part of the manifold. The spring goes on those. Hopefully that makes sense, put in a picture. If that's not the spring your talking about and I'm assume we're talking stock exaust, I dunno of any othe springs on it.
