The Stainless Bros SS304 Thin Oval Muffler features extra fiberglass material, making it a quieter alternative to our round mufflers while also providing an "OEM+" look with its oval design and polished finish. This muffler is a mirror image of the regular Center/Offset thin oval, allowing the fabricator to have both muffler body seams face upwards in a side-by-side muffler install. For example, when viewed from the back of the car, one offset is to the driver side and one offset is to the passenger side, both with the muffler body seams facing upwards.