I did an engine rotate today to fix an oil leak and I noticed something very odd. Those of yall that have pulled off the stock muffler, have yall noticed if there was 3 sides of a rectangle welded up on the top side of the muffler, about in the middle of the muffler. I am just trying to figure out if the previous owner did something with the muffler being as for some reason they disconnected the muffler side of the inter active exhaust.