MagnaFlow Performance Exhaust has spun body catalytic converters utilizing the revolutinary new metallic catalyst technology. Using new manufacturning technology Magnaflow fabricates each converter body from single CNC-formed and laster welded tubular section which is then spun into a round converter body shape. Each converter is literally manufactured around the metallic catalyst which is securely tucked inside and necks down to thicker gauge material at the inlet/outlet for maximum durability. The catalyst is a spirally wound ultra thin metallic foil.