REMOVABLE DBKILLERS AND CATALYSTS: IT IS POSSIBLE TO REMOVE THE NOISE REDUCER (DBKILLERS) AND CATALYST ONLY FOR RACING USE IN THE CIRCUITS, THE USE OF THE OPEN VERSION ON THE ROAD IN DOES NOT COMPLY WITH THE REGULATIONS GOVERNING CIRCULATION ON THE PUBLIC ROAD NETWORK. EVO4ROAD, MADE OF 304 STAINLESS STEEL WITH CERAMIC PAINTING FOR HIGH TEMPERATURES, OVAL SHAPE DIAMETER 90X120MM. .