The Invidia WRX Turbo Back Exhaust System is constructed with fully polished SUS 304 stainless steel. The flex joints are used to dampen the cat-back exhaust system from engine vibration. The exhaust features CNC machined flanges, robot TIG welded, and computerized mandrel-bent tubing for the straightest possible line and the lease amount of bends. The downpipe is constucted of 304 stainless steel with a large bellmouth will ensure longevity while enhancing power by freeing wastegate gaskets. Call For Different Cat-Back Options. For Off Road use Only