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Application Subaru Impreza 97-05 Impreza RS Legacy GT Header 1998 RS Coupe 2D 2.5L DOHC 1999-2001 RS Coupe 2D 2.5L SOHC 2001-2005 RS Senda 4D 2.5L SOHC 2002-2004 TS Wagon 4D 2.5L SOHC 2002-2004 Outback Wagon 4D 2.5L SOHC 2005 RS Wagon 4D 2.5L SOHC 2005 Outback Sport Wagon 4D 2.5L SOHC Subaru Legacy GT 97-05 2.5L 4DR Wagon w/o Oil Cooler 4-2-1 Unequal lenght design increases both torque and horsepower Fully polished stainless steel structure with high quality finish Factory 02 sensor position Japan spec with mandrel bent piping Machined flange TIG Welded Piping size 2.5" and 1.5" tubular piping Easy Bolt on Gasket and bolts are included Increase 15-25 HP Light Weight Design Vehicle Fitment Information1998-2005 Subaru Impreza