DIESEL METALLIC-CAT - (These universal converters are specially formulated to control diesel exhaust.) 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.