Blow out the old one and after some research replaced it with this one. After replacing some wheel bearings, manifold gaskets and other squeaky parts in combination with this muffler, the sound is like new! I'm giving this 4 stars instead of 5 because I was inclined to put many coats of 2500*F high temp spray paint on it to keep rust and dirt off. Any coatings I put on it may have even helped isolate the sound better.