Subaru Impreza WRX/STI 02-07 MeganRacing Downpipe /DE-CAT V2 Version 2 includes thicker gauge steel piping and a new and improved finish and quality. 100% T-304 Stainless Steel with computerized mandrel-bends 3" piping, bell mouth design CNC-machined flanges for strong solid support TIG-welded for strength and durability 3-stage polish for a mirror-like finish Increase around 10-16 horse power and torque Straight-through design and bolt-on installation Megan Racing Stainless Steel Down-pipes are made of the same high-quality T-304 that is utilized in our Headers and Turbo Manifolds for extreme durability and resistance to corrosion and cracking. The missing component between any Header/Manifold and your Cat-Back system, these Down-pipes will complete the high-flow exhaust system desired for the performance of your vehicle. With a noticeable power gain throughout the rev-range and a polished finish, these are a perfect addition for any performance vehicle. Expect an increase in exhaust tone, due to freeing up the exhaust flow and the deletion of the catalytic converter. (NOTE: For off-road use only, not intended for use on public highways.)