a soot filter for removing soot from engine exhaust . the soot filter comprises an inlet , an outlet disposed opposite the inlet , a first corrugated layer having a first series of parallel ridges extending from the inlet to the outlet and aligned in a first direction , and a second corrugated layer having a second series of parallel ridges extending from the inlet to the outlet and aligned in a second direction . the second direction is oblique to the first direction , with the first series of parallel ridges being obliquely angled along an entire path from the inlet to the outlet . in this way , a variety of flow paths can be provided to increase particulate trapping .