GReddy 02-07 WRX/ STi Competition Downpipe The Greddy competition downpipe for the 02-07 WRX & 04-07 STI is the perfect choice for those looking for power on a budget. Featuring a CNC designed and computer cut flat inlet flange, the Greddy competition downpipe is built tough with fully mandrel bent and TIG welded stainless steel construction for extreme durability, ensuring years of quality performance. When Greddy named this the Competition downpipe, they meant it! This downpipe deletes both factory catalytic converters and uses a standard 3" flat flange connection to bolt seamlessly to any 3" catback exhaust system. While the Greddy competition downpipe does not have a bellmouth inlet, rest assured that this downpipe will still have significant horsepower gains due to the enhanced exhaust flow and deleted factory cats.