The one I had required removing the baffle. The muffler was flat. It's height was the same as the exhaust flange and it's width the same as the exhaust. If I recall correctly it stuck out from the engine about 2 inches (approx). It was kept in alignment to the exhaust by 2 tabs, 1 at each end of the port that inserted into the port and also covered the holes left when the baffle was removed. A metal strap was then wrapped around the cylinder head and screw attached to each side of the muffler. Worked great.