Cobb Tuning engineered their 03-06 Evolution 8 & 9 downpipe to fit the specific needs of the Evo's chassis. Cobb accounted for the space required for their downpipe to fit around the factory chassis bracing without the need for additional spacing. Cobb used mandrel bent 304 stainless steel tubing for exceptional durability and performance. Coupled with a racepipe or stock cat, the Cobb Evo 8 & 9 downpipe will improve exhaust flow significantly.