TiTek Stainless Steel Down Pipe 02-07 Subaru Impreza WRX/STi (w/o CAT) - P/N: SUB-10001 TiTek Innovations fully polished stainless steel downpipe for the 02-06 WRX / STI are offered with a straight flow design through our smooth bellmouth transitioning to our full 3” mandrel bent finishing. This downpipe will help increase horsepower by maximizing exhaust flow efficiency. This item is an easy bolt-on upgrade for stock and upgrade turbochargers for horsepower gains. **Recommended purchase: 02-03(may not be necessary) or 04+ Titek CEL Fix Kit. Includes all necessary hardware (gaskets, nuts, bolts). Developed For Offroad Use Only.